basic unit of life = group of specialized cells = ● 4 types - (includes glands and tissues that...
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INTRODUCTION TO BODY SYSTEMS
LEVELS OF ORGANIZATION Basic unit of life =
Group of specialized cells =● 4 Types
- (includes glands and tissues that cover body surfaces)
- (provide support)- (transmits nerve impulses)- (enables movement)
Group of different types of tissues =
Group of organs that perform related functions =
Cells
Tissues
Organs
Organ Systems
Epithelial
ConnectiveNervousMuscle
MAINTAINING A STABLE ENVIRONMENT HOW MANY ORGAN SYSTEMS are there?
_______ THESE ORGAN SYSTEMS WORK TOGETHER TO
MAINTAIN _________________ IN THE BODY.
Homeostasis:
Feedback inhibition:
11
Homeostasis
Process by which organisms maintain a stable internal environment
Process in which a stimulus produces a response that opposes the original stimulus
Nervous System
Interesting Fact:
The human brain weighs about 3.5 lbs.
Rat Brain
Main Organs / Structures Central Nervous System
- Brain- Spinal Cord
Peripheral Nervous System- Nerves
Specialized Cells• Neurons - carry the nerve impulse
Interesting Fact:Number of neurons in human spinal cord = 1 billion
Dendrites
Cell body
Axon
Nucleus
Endocrine
SystemWhen I say
ENDOCRINE, you say
HORMONE.
Function of the System• Control by delivering
messages (hormones) throughout the body
• Slower and longer lasting effects than the nervous system
• Maintain homeostasis
Main Organs / Structures• Glands – release hormones
into bloodstream [adrenal, thyroid, pancreas, pituitary, hypothalamus] Hormones – chemicals released in the bloodstream that effect a target cell
Skeletal
System
mandible
cranium
clavicle
humerus sternumribs
ulna
radius
Vertebralcolumn
pelvis
femur
patellatibia
fibula
Interesting Facts:• The smallest
bones in the body are found in the ear.
• The longest bone in the body is the femur.
Interesting Fact:
Crabs and lobsters, insects have
exoskeletons
(skeletons on the
outside of their
bodies)
Function• Support• Protection of internal
organs• Store minerals• Produce blood cells
Main Organs / Structures
Bones & Cartilage
Muscular
SystemInteresting Facts:Muscles make up nearly
half the weight of the human body, this is why
when we train we sometimes put on weight
instead of losing it.
Function Contraction & Movement
- energy supplied by ATP
Main Organs / Structures
Muscles – skeletal (voluntary movement)
- cardiac (heart) - smooth (involuntary)
exp. digestive & circulatory
(esophagus & stomach)
(walls of blood
vessels)
Circulatory
System
Interesting Fact:
The roar that we
hear when we place a
seashell next to our ear is not the ocean, but rather the sound of blood surging
through the veins in the
ear.
Function• highways : city :: circulatory :
human
Transport of oxygen, nutrients and waste products
Interesting Fact:
It takes about 20 seconds for
a red blood cell to circle the whole
body.
Main Organs / Structures
Heart Blood Vessels
- Veins – return blood to the heart- Arteries – carry blood from the heart to the body
Specialized Cells- Red Blood Cells – transport oxygen
- White Blood Cells – attack pathogens
- Platelets – formation of blood clots
Red Blood Cell• Contains a protein called hemoglobin to which the oxygen binds• What are the building blocks of proteins?
Amino Acids
Respiratory
System
Interesting Fact:Your left lung is
smaller than your right lung
to make room for your heart.
Function• Exchange of oxygen and
carbon dioxide between the blood, the tissues, and the air
Reminder: Cellular Respiration
• C6H12O6 + 6 O2 6 CO2 + 6 H2O
• O2 in ; CO2 out
Main Organs / Structures
Nose, Mouth, Pharynx
Larynx (voice box) Lungs Bronchi (branches) Alveoli (air sacs) Diaphragm - muscle
Immune System
Interesting Fact:Laughing lowers levels of stress hormones and
strengthens the immune system.
Function of the System
Fight infection Main defense against pathogens
Immunity
Main Organs / Structures Bone Marrow
Thymus Spleen Lymph nodes
Specialized Cells T-cells [HIV virus attacks]
Antibodies – proteins that identify & neutralize foreign objects
Integumentary System
Interesting Fact:Human hair and
fingernails continue to grow
after death.
Function Barrier against infection & injury
Regulates body temperature Prevents desiccation (drying out)
Provides UV protection
Main Organs / Structures
• Skin – single largest organ in the body• Hair• Nails
Reproductive
SystemInteresting Fact:
The female human body is capable of
giving birth to 35 children in one lifetime.
Function of the System Reproduction
Produces, stores & releases specialized cells gametes
Main Organs / Structures Testis, penis
Ovaries, Uterus
Specialized Cells
Gametes
sperm egg
Digestive
System
Interesting Fact:The reason honey is so
easy to digest is that it’s already been digested
by a bee.
Function• Break food down into smaller molecules that can be absorbed by cells
Main Organs / Structures Mouth
□ chewing - mechanical digestion□ enzymes – chemical digestion
Esophagus (food tube)
Main Organs / Structures
Carbohydrates, Lipids, Proteins (macromolecules)
Vitamins & Minerals
Nutrients:
Stomach (high acidity-low pH) Small & Large Intestines (has villi for
absorption) Liver (filter-detoxifies harmful substances)
Pancreas (produces insulin)
Gall Bladder (store bile)
Kidney
Ureters
Urethra
UrinaryBladder
Frog
Excretory
System
homeo
stasis
Interesting Fact:All the blood in our body passes 400 times through each kidney every day.
Function of the System
Excretion – elimination of metabolic wastes (urea)
Remove waste from blood Maintain blood pH Regulate H2O content
Main Organs / Structures Skin
Kidney□ maintain acid-base
(pH) balance□ regulate blood
pressure□ filters blood
Ureters Urinary Bladder Urethra
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