the human body – an orientation slide 1.1 copyright © 2003 pearson education, inc. publishing as...
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The Human Body – An OrientationThe Human Body – An Orientation
Slide 1.1Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Anatomy – study of the structure and shape of the body and its parts
• Physiology – study of how the body and its parts work or function
Anatomy – Levels of StudyAnatomy – Levels of Study
Slide 1.2aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Gross Anatomy
• Large structures
• Easily observable
Figure 1.1
Anatomy – Levels of StudyAnatomy – 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
Figure 14.4
Levels of Structural OrganizationLevels of Structural Organization
Slide 1.3Copyright © 2003 Pearson Education, Inc. publishing as Benjamin CummingsFigure 1.1
Organ System OverviewOrgan System Overview
Slide 1.4Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Integumentary
• Forms the external body covering
• Protects deeper tissue from injury
• Synthesizes vitamin D
• Location of cutaneous nerve receptors
Figure 1.2a
Organ System OverviewOrgan System Overview
Slide 1.5Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Skeletal
• Protects and supports body organs
• Provides muscle attachment for movement
• Site of blood cell formation
• Stores mineralsFigure 1.2b
Organ System OverviewOrgan System Overview
Slide 1.6Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Muscular
• Allows locomotion
• Maintains posture
• Produces heat
Figure 1.2c
Organ System OverviewOrgan System Overview
Slide 1.7Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Nervous
• Fast-acting control system
• Responds to internal and external change
• Activates muscles and glands
Figure 1.2d
Organ System OverviewOrgan System Overview
Slide 1.8Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Endocrine
• Secretes regulatory hormones
• Growth
• Reproduction
• Metabolism
Figure 1.2e
Organ System OverviewOrgan 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
• WastesFigure 1.2f
Organ System OverviewOrgan System Overview
Slide 1.10Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Lymphatic
• Returns fluids to blood vessels
• Disposes of debris
• Involved in immunity
Figure 1.2g
Organ System OverviewOrgan System Overview
Slide 1.11Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Respiratory
• Keeps blood supplied with oxygen
• Removes carbon dioxide
Figure 1.2h
Organ System OverviewOrgan 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
Organ System OverviewOrgan System Overview
Slide 1.13Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Urinary
• Eliminates nitrogenous wastes
• Maintains acid – base balance
• Regulation of materials
• Water
• ElectrolytesFigure 1.2j
Organ System OverviewOrgan System Overview
Slide 1.14Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Reproductive
• Production of offspring
Figure 1.2k
Necessary Life FunctionsNecessary Life Functions
Slide 1.15Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Maintain Boundaries
• Movement
• Locomotion
• Movement of substances
• Responsiveness
• Ability to sense changes and react
• Digestion
• Break-down and delivery of nutrients
Necessary Life FunctionsNecessary Life Functions
Slide 1.16aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Metabolism – chemical reactions within the body
• Production of energy
• Making body structures
• Excretion
• Elimination of waste from metabolic reactions
Necessary Life FunctionsNecessary Life Functions
Slide 1.16bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Reproduction
• Production of future generation
• Growth
• Increasing of cell size and number
Survival NeedsSurvival Needs
Slide 1.17aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Nutrients
• Chemicals for energy and cell building
• Includes carbohydrates, proteins, lipids, vitamins, and minerals
• Oxygen
• Required for chemical reactions
Survival NeedsSurvival Needs
Slide 1.17bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Water
• 60–80% of body weight
• Provides for metabolic reaction
• Stable body temperature
• Atmospheric pressure must be appropriate
HomeostasisHomeostasis
Slide 1.18Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Maintenance of a stable internal environment = a dynamic state of equilibrium
• Homeostasis must be maintained for normal body functioning and to sustain life
• Homeostatic imbalance – a disturbance in homeostasis resulting in disease
Maintaining HomeostasisMaintaining Homeostasis
Slide 1.19aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• The body communicates through neural and hormonal control systems
• Receptor
• Responds to changes in the environment (stimuli)
• Sends information to control center
Maintaining HomeostasisMaintaining Homeostasis
Slide 1.19bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Control center
• Determines set point
• Analyzes information
• Determines appropriate response
• Effector
• Provides a means for response to the stimulus
Feedback MechanismsFeedback Mechanisms
Slide 1.20aCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Negative feedback
• Includes most homeostatic control mechanisms
• Shuts off the original stimulus, or reduces its intensity
• Works like a household thermostat
Feedback MechanismsFeedback Mechanisms
Slide 1.20bCopyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings
• Positive feedback
• Increases the original stimulus to push the variable farther
• In the body this only occurs in blood clotting and birth of a baby