the human body: an orientation - yolamscoxholyname.yolasite.com/resources/ch.1 organization.pdf ·...
TRANSCRIPT
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Essentials of Human Anatomy & Physiology
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Seventh Edition
Elaine N. Marieb
Chapter 1
The Human Body:
An Orientation
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Essentials of Human Anatomy & Physiology
Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Directions:
Record the following information into
your notebook (to be checked).
All terms in red are key vocabulary.
You will be tested these terms.
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
anatomy: the study of the structure and shape of the body and its parts
physiology: the study of how the body and its parts work or function
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
anatomy: form (structure)
physiology: function
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
What is the relationship between anatomy and physiology?
anatomy: form (structure)
physiology: function
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
What is the relationship between anatomy and physiology?
Physiology is the study of how the
anatomy of the human body functions.
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
What is the relationship between anatomy and physiology?
Physiology is the study of how the
anatomy of the human body functions,
due to it’s shape. Form fits function.
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
physiology: the study of how the body and its parts work or function
Pathophysiology: the study of …?
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
physiology: the study of how the body and its parts work or function
Patho - physiology: the study of …?
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
physiology: the study of how the body and its parts work or function
Patho - physiology: the study of …?
disease – human body functions
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The Human Body – Introduction
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
physiology: the study of how the body and its parts work or function
Pathophysiology: the study of human
disease and abnormalities.
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Anatomy – Levels of Study
Slide 1.2aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Gross Anatomy
• Large structures
• Easily observable
• Example: large intestine
Figure 1.1
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Anatomy – Levels of Study
Slide 1.2bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Microscopic Anatomy
• Very small structures
• Can only be viewed with a microscope
• Ex. absorption
mechanism in the kidney
Figure 14.4
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Anatomy – Levels of Study
Slide 1.2bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Microscopic Anatomy
• In order to learn about an object,
it is important to understand
the parts that it is made of!
Figure 14.4
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form
2.
3.
4.
5.
largest 6. human organisms are made up of
many organ systems
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2.
3.
4.
5.
largest 6. human organisms are made up of
many organ systems
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2. cells are made up of molecules
3.
4.
5.
largest 6. human organisms are made up of
many organ systems
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2. cells are made up of molecules
3. tissues consist of similar types of cells
4.
5.
largest 6. human organisms are made up of
many organ systems
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2. cells are made up of molecules
3. tissues consist of similar types of cells
4. organs are made up of similar tissues
5.
largest 6. human organisms are made up of…
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2. cells are made up of molecules
3. tissues consist of similar types of cells
4. organs are made up of similar tissues
5. organ systems are made up of many
organs working together
largest 6. human organisms are made up of…
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2. cells are made up of molecules
3. tissues consist of similar types of cells
4. organs are made up of similar tissues
5. organ systems are made up of many
organs working together
largest 6. human organisms are made up of
many organ systems
Levels of Structural Organization
Slide 1.3
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Of the human body,
name the 6 levels of structural organization:
smallest 1. atoms combine to form molecules
2. cells are made up of molecules
3. tissues consist of similar types of cells
4. organs are made up of similar tissues
5. organ systems are made up of many
organs working together
largest 6. human organisms are made up of
many organ systems
Levels of Structural Organization
Slide 1.3
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Levels of Structural Organization
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 1.1
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Form fits function.
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Form fits function.
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Neuron (brain cell)
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Form fits function.
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Form fits function.
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Art + Science = Genius
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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About Neurons : 4m https://www.youtube.com/watch?v=cUGuWh2UeMk&feature=youtu.be
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Organ System Overview
Slide 1.4Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Integumentary System
• Forms the external body covering
• Protects deeper tissue from injury
• Synthesizes vitamin D
• Location of cutaneous nerve receptors
Figure 1.2a
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Organ System Overview
Slide 1.5Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Skeletal System
• Protects and supports body organs
• Provides muscle attachment for movement
• Site of blood cell formation
• Stores minerals
Figure 1.2b
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Organ System Overview
Slide 1.5Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Skeletal System
• Protects and supports body organs
• Provides muscle attachment for movement
• Site of blood cell formation
• Stores minerals Example(s)?
-femur
-spinal cord
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Organ System Overview
Slide 1.5Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Skeletal System
• Protects and supports body organs
• Provides muscle attachment for movement
• Site of blood cell formation
• Stores minerals
Figure 1.2b
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Organ System Overview
Slide 1.6Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Muscular System
• Allows for locomotion
• Maintains posture
• Produces heat
Figure 1.2c
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Organ System Overview
Slide 1.7Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Nervous System
• Fast-acting control
system
• Responds to
internal and external
changes
• Activates muscles
and glands
Figure 1.2d
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Organ System Overview
Slide 1.8Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Endocrine System
Secretes regulatory hormones, to control:
• growth
• reproduction
• metabolism
Figure 1.2e
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Organ System Overview
Slide 1.8Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Endocrine System
Secretes regulatory hormones, to control:
• growth
• reproduction
• metabolism
Figure 1.2e
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Organ System Overview
Slide 1.9Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Cardiovascular
Transports materials in body, via blood pumped by heart
• oxygen
• carbon dioxide
• nutrients
• wastes
Figure 1.2f
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Organ System Overview
Slide 1.10Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Lymphatic System
• Returns fluids to blood vessels
• Disposes of debris
• Involved in immunity
Figure 1.2g
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Organ System Overview
Slide 1.10Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Lymphatic System
• Returns fluids to blood vessels
• Disposes of debris
• Involved in immunity
Figure 1.2g
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Organ System Overview
Slide 1.11Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Respiratory System
• Keeps blood supplied with oxygen
• Removes carbon dioxide
Figure 1.2h
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Organ System Overview
Slide 1.12Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Digestive
• Breaks down food
• Allows for nutrient
absorption into blood
• Eliminates indigestible
material
Figure 1.2i
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Organ System Overview
Slide 1.12Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Digestive
• Breaks down food
• Allows for nutrient
absorption into blood
• Eliminates indigestible
material
Figure 1.2i
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Organ System Overview
Slide 1.13Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Urinary System
• Eliminates nitrogenous wastes
• Maintains acid – base balance
• Regulation of materials
• water
• electrolytes
Figure 1.2j
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Organ System Overview
Slide 1.13Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Urinary System
• Eliminates nitrogenous wastes
• Maintains acid – base balance
• Regulation of materials
• water
• electrolytes
Figure 1.2j
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Organ System Overview
Slide 1.14Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Reproductive
• Production of gametes
• Production of offspring.
• Only system not needed for survival of the individual!
Figure 1.2k
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Maintaining equilibrium
Slide 1.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
homeostasis: stable internal environment
Ex.) internal body temperature(37°C = 98.6°F)
Ex.) constant blood-calcium levels (9-11mg of calcium per 100ml of blood)
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Maintaining equilibrium
Slide 1.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Homeostasis must be maintained for normal body functioning and to sustain life
• What do we need to balance?
-feedback loop system
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Feedback System - vocabulary
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
stimulus: something that occurs, that signals an action (in reaction)
feedback: a signal that carries information
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Feedback System - vocabulary
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
receptor (sensor): senses changes in environment and sends info to the:
control center: to figure out how to respond factor (too little or too much of something); maintenance needs are sent to the:
effector: initiates action (release of chemicals), needed to reach homeostasis
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Feedback System - vocabulary
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
stimulus: external or internal event
receptor (sensor): a sensory organ
control center: chemicals are released to signal an action
effector: an organ that acts in response to a signal
feedback: chemicals that carries information
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Feedback Loop (structure)
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Receptor
Environmental
stimulus
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Feedback Loop - example
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Hypothalamus
Temperature
increasesChemicals
released
Sweat glands
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Asa's environment is changed when his taller, younger
sister presses her hand onto one of his shoulders. Asa's
standing body position is altered by this stimulus; he is
suddenly unbalanced from the weight. His nervous
system recognizes this change in his standing posture. A
chemical signal is sent from his nervous system to his
skeletal and muscular systems, to straighten the body
position and tighten the muscles. With this response, Asa
is able to maintain his balance.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Asa's environment is changed when his taller, younger
sister presses her hand onto one of his shoulders. Asa's
standing body position is altered by this stimulus; he is
suddenly unbalanced from the weight. His nervous
system recognizes this change in his standing posture. A
chemical signal is sent from his nervous system to his
skeletal and muscular systems, to straighten the body
position and tighten the muscles. With this response, Asa
is able to maintain his balance.
NEGATIVE FEEDBACK
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Feedback Loop - example
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Standing
body position
Hand on
shoulderChemicals sent to
brain, spine, muscles
(to change due to
weight added)
Back and shoulder
muscles tighten
(contract)
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Usually well-hydrated, Peter has not had a sip of water in
6 hours. His body is dehydrated. This low water content
in his body is detected by the hypothalamus. The
hypothalamus signals to the pancreas to create and
release the hormone vasopressin. This chemical travels to
the kidney, which tells the organ to reabsorb water from
the urine. This helps the body to conserve water, until
more fluids are consumed.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Usually well-hydrated, Peter has not had a sip of water in
6 hours. His body is dehydrated. This low water content
in his body is detected by the hypothalamus. The
hypothalamus signals to the pancreas to create and
release the hormone vasopressin. This chemical travels to
the kidney, which tells the organ to reabsorb water from
the urine. This helps the body to conserve water, until
more fluids are consumed.
NEGATIVE FEEDBACK
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Aria walks by a locker, quickly and with out awareness
of her surroundings. She bumps her arm into the edge of
a locker door, and damages a blood vessel. She begins to
bleed. Platelets start to flow through this vessel have to
cling to the injured site. This sensor releases chemicals,
intended to attract more platelets. Platelets continue to
pile up (while releasing more signaling chemicals), until
a clot is formed.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Aria walks by a locker, quickly and with out awareness
of her surroundings. She bumps her arm into the edge of
a locker door, and damages a blood vessel. She begins to
bleed. Platelets start to flow through this vessel have to
cling to the injured site. This sensor releases chemicals,
intended to attract more platelets. Platelets continue to
pile up (while releasing more signaling chemicals), until
a clot is formed.
POSITIVE FEEDBACK
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Hadley is going into child birth. When the baby’s head
pushes against the walls of the uterus, her body senses
that labor is to begin. This pressure on the uterus causes
the body to release oxytocin, a hormone that intensifies
and speeds up contractions. Oxytocin is released into the
bloodtream, which travels back to the uterus. This
chemical is a signal that contractions should continue.
This feedback loop continues until the baby is born, until
there is no more pressure on the walls of the uterus.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Hadley is going into child birth. When the baby’s head
pushes against the walls of the uterus, her body senses
that labor is to begin. This pressure on the uterus causes
the body to release oxytocin, a hormone that intensifies
and speeds up contractions. Oxytocin is released into the
bloodtream, which travels back to the uterus. This
chemical is a signal that contractions should continue.
This feedback loop continues until the baby is born, until
there is no more pressure on the walls of the uterus.
POSITIVE FEEDBACK
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Due to the cold environment, an external stimulus results in a
change in the internal conditions. When the body temperature
drops below 37 degrees Celsius, the brain detects the change. The
hypothalamus causes the secretion of a hormone through the
bloodstream. This chemical signals to the skin to constrict (tighten)
blood vessels. This mechanism is to allow the warmth of blood to
be retained deeper in the body. Less heat will be lost on the surface
of the skin. This cycle continues until the body warms back up to
37 degrees Celsius.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Due to the cold environment, an external stimulus results in a
change in the internal conditions. When the body temperature
drops below 37 degrees Celsius, the brain detects the change. The
hypothalamus causes the secretion of a hormone through the
bloodstream. This chemical signals to the skin to constrict (tighten)
blood vessels. This mechanism is to allow the warmth of blood to
be retained deeper in the body. Less heat will be lost on the surface
of the skin. This cycle continues until the body warms back up to
37 degrees Celsius.
NEGATIVE FEEDBACK
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
While parked at an intersection, Molly watches as the
driver next to her speeds away while texting. This driver
just misses a pedestrian crossing the street. This stressful
situation increases Molly’s blood pressure. Baroreceptors
in certain blood vessels pick up on this change to Molly’s
internal balance. The brain interprets this sensation and
sends chemical signals through nerve impulses, telling
the heart to slow down, to beat at a slower pace. This
brings Molly back to homeostasis.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
While parked at an intersection, Molly watches as the
driver next to her speeds away while texting. This driver
just misses a pedestrian crossing the street. This stressful
situation increases Molly’s blood pressure. Baroreceptors
in certain blood vessels pick up on this change to Molly’s
internal balance. The brain interprets this sensation and
sends chemical signals through nerve impulses, telling
the heart to slow down, to beat at a slower pace. This
brings Molly back to homeostasis.
NEGATIVE FEEDBACK
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Feedback Loop - example
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Baroreceptors
in blood vessels
Stress from
observing near
death
Brain sends
chemical signals
through
nerve impulses
Heart pumps more
slowly, lowering
blood pressure
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Your stomach normally secretes a compound called pepsinogen
that is an inactive enzyme. When food is ingested, the
hypothalamus detects the addition of sugars into the body. The
hypothalamus, the main controller of the endocrine system,
releases gastrin, a hormone. This hormone communicates with the
stomach. Cells lining the stomach are told to secrete of
hydrochloric acid and pepsin. These enzymes help break down the
sugar molecules.
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Your stomach normally secretes a compound called pepsinogen
that is an inactive enzyme. When food is ingested, the
hypothalamus detects the addition of sugars into the body. The
hypothalamus, the main controller of the endocrine system,
releases gastrin, a hormone. This hormone communicates with the
stomach. Cells lining the stomach are told to secrete of
hydrochloric acid and pepsin. These enzymes help break down the
sugar molecules.
POSITIVE FEEDBACK
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Feedback System – Example scenario
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Your stomach normally secretes a compound called pepsinogen
that is an inactive enzyme. When food is ingested, the
hypothalamus detects the addition of sugars into the body. The
hypothalamus, the main controller of the endocrine system,
releases gastrin, a hormone. This hormone communicates with
the stomach. Cells lining the stomach are told to secrete
hydrochloric acid and pepsin. These enzymes help break down the
sugar molecules.
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Feedback Loop - example
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
hypothalamus
Food is
ingested (eaten)gastrin
(hormone)
is released
Cells lining stomach
secrete hydrochloric
acid and pepsin
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Demonstrate a Feedback Loop
Slide 1.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Directions: In a groups of 2-3, create an example of a feedback loop.
1. Draw the Feedback Loop structure on a piece of paper, and describe what is occurring, by filling in each box.
2. Physically perform your example in front of the class. As the action occurs, only one must explain what is happening. This narrator must use the following 5 vocabulary terms in the description:
stimulus, receptor, control center, effector, feedback
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Feedback Loop (structure)
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Receptor
Environmental
stimulus
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Feedback Loop: Blood-Calcium levels
Slide 1.19a
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Slide 1.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
homeostatic imbalance: a disturbance in homeostasis, resulting in disease
Examples:
• Autoimmune disorders
• Low blood sugar
• High blood pressure
• Hyperthyroidism….and many others
Homeostatic Imbalance
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• Role and anatomy of the pancreas 3:15m
• Pancreas form and function:
https://www.youtube.com/watch?v=DBvOsL-
gg3s
• https://www.youtube.com/watch?v=NZ4zcrTzUj
A
• + diabetes:
https://www.youtube.com/watch?v=qzjjW--I-2Q
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Homeostatic Imbalance
Slide 1.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Maintaining Homeostasis
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
How do all your trillions of cells work together to maintain homeostasis?
They have a really good, really complicated communication (feedback loops) system
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Maintaining Homeostasis
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
The body communicates through neural and hormonal control systems.
neural: brain and nerve sending messages.
hormonal: chemicals being sent throughout the body to tell cells what to do (usually also controlled by brain)
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Feedback Mechanisms
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Two ways to do this:
1. Negative Feedback
2. Positive Feedback
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Feedback Mechanisms
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Two ways to do this:
1. Negative Feedback –aims to
establish homeostasis
Positive Feedback - aims to
get a job done (fulfill a function)
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Feedback Mechanisms
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Negative feedback
• shuts off or reduces the intensity of the control center
• most control mechanisms are negative
Ex: household thermostat controls the heating of a house
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Feedback Loop (structure)
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Receptor
Environmental
stimulus
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Feedback Loop (structure)
Slide 1.19a
Receptor
Environmental
stimulus
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Feedback Mechanisms
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Positive feedback
•pushes control center to continue (but will eventually stop)
•uncommon in body, doesn’t establish balance
Ex.
Blood clotting
Labor contractions
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Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Positive feedback
•pushes control center to continue (but will eventually stop)
•uncommon in body, doesn’t establish balance
Ex.
Blood clotting
Labor contractions
Drawing a Feedback Mechanism
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Feedback Loop: Blood-Calcium levels
Slide 1.19a
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Drawing a Feedback Mechanism
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Directions:
1. Draw a square, to represent the receptor. Label the receptor.
2. Draw 2 squares (1 above, 1 below the receptors), to represent the
effectors. Label the effectors.
The box above is the effector in a positive feedback system.
The box below is the effector in a negative feedback system.
3. Draw two sets of arrows, that travel from the receptor to the
effectors, and back to the receptor. Label the arrows toward the
effectors with the control system mechanism.
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Drawing a Feedback Mechanism
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
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Slide 1.20a
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Feedback Loop - example
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Hypothalamus
Temperature
increasesChemicals
released
Sweat glands
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Drawing a Feedback Mechanism
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Directions:
Draw a feedback mechanism diagram, using the example of how the
body maintains temperature equilibrium.
Example:
When the body is above 37 degrees Celsius, the hypothalamus
releases chemicals, signaling the sweat glands to release liquid. This
cools the body.
When the body is below 37 degrees Celsius, the hypothalamus
releases chemicals, signaling to the nervous to make muscles
contract. This generates heat, to warm the body.
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Drawing a Feedback Mechanism
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Directions:
Draw a feedback mechanism diagram, using the example of how the
body maintains temperature equilibrium.
Example:
When the body is above 37 degrees Celsius, the hypothalamus
releases chemicals, signaling the sweat glands to release liquid. This
cools the body.
When the body is below 37 degrees Celsius, the hypothalamus
releases chemicals, signaling to the nervous to make muscles
contract. This generates heat, to warm the body.
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Disease Versus Disorder
Slide 1.21Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
disease: illness characterized by a recognizable set of symptoms and signs
disorder: any abnormality of structure and function
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Disease Versus Disorder
Slide 1.21Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
symptoms: subjective changes in body functions (not apparent to observer)
signs: objective changes in body functions (observable by others)
aging: process in which there is a progressive decline in the body’s ability to restore homeostasis
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Section 1.4: Restate the Qs (6-8) on p10
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
1.4 Homeostasis: Maintaining Limits
Objectives:
Can I answer all of these by the end of my reading?
If yes, you have read well (active reading)
If no, re-read, change techniques:
Record/define vocab, draw images, watch videos
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Section 1.4: Restate the Qs (6-8) on p10
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
6. The types of disturbances that can act as stimuli
that initiate a feedback system are either internal or
external. For example, (external) intense heat, lack of
oxygen, social stresses, or (internal) blood glucose
levels (p8).
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Section 1.4: Restate the Qs (6-8) on p10
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
7. The negative and positive feedback systems are
similar because they are a cycle of events that functions
to continually monitor, evaluate, change, remonitor, and
reevaluate a condition in the body (p8).
The negative and positive feedback systems are
different. Negative feedback systems reverse a change
in the body’s controlled condition (homeostasis).
Positive feedback systems strengthen a change in the
body’s controlled condition.
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Section 1.4: Restate the Qs (6-8) on p10
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
8. Symptoms and signs of a disease may be contrasted.
A symptom is a change in body functions that are not
easily observed by another person (ex. headache, nausea).
A sign is a change in body functions that can be measured
by a clinician (ex. bleeding, fever).
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Vocabulary
Slide 1.21Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
diagnose: to distinguish one disease from another or
determining the nature of a disease; a diagnosis is typically
arrived at after the taking of a medical history and after a
physical examination.
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The Language of Anatomy
Slide 1.21Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Special terminology is used to prevent misunderstanding
• Exact terms are used for:
• Position
• Direction
• Regions
• Structures
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Orientation and Directional Terms
Slide 1.22Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Table 1.1
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Orientation and Directional Terms
Slide 1.23Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Table 1.1 (cont)
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Body Landmarks
Slide 1.24Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Anterior
Figure 1.5a
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Body Landmarks
Slide 1.25Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Posterior
Figure 1.5b
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Body Planes
Slide 1.26Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 1.6
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Body Cavities: Dorsal and Ventral
Slide 1.27Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 1.7
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Body Cavities: Abdominopelvic
Slide 1.27Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
Figure 1.7
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• Pin the “tail” on the skeleton(borrow) game
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Necessary Life Functions
Slide 1.15Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
1. Maintain Boundaries
2. Movement
• Locomotion
• Movement of substances
3. Responsiveness
• Ability to sense changes and react
4. Digestion
• Break-down and delivery of nutrients
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Necessary Life Functions
Slide 1.16aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
5. Metabolism – chemical reactions within the body
• Production of energy
• Making body structures
6. Excretion
• Elimination of waste from metabolic reactions
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Necessary Life Functions
Slide 1.16bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
7. Reproduction
• Necessary for the individual????
• Production of future generation
8. Growth
• Increasing of cell size and number
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Survival Needs
Slide 1.17aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
So, what do you need to stay alive????
• Nutrients
• Chemicals for energy and cell building
• Includes carbohydrates, proteins, lipids, vitamins, and minerals
• Oxygen
• Required for chemical reactions
• Why?
• Need it to break down food into ATP
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Survival Needs
Slide 1.17b
• Water
• 60–80% of body weight
• Provides for metabolic reactions
• Maintains blood volume
• Stable body temperature
• We are endothermic afterall!
• Atmospheric pressure must be appropriate.Why?
• To allow us to breath.