MAJOR ORGAN SYSTEMS
IN THE HUMAN BODY
SCIENCE, TECHNOLOGY, & SOCIETY CLASS
MR. CANOVA
PERIOD 11
THE 11 MAJOR ORGAN SYSTEMS
OF THE HUMAN BODY:
Circulatory
Digestive
Endocrine
Excretory
Immune
Muscular
Nervous
Reproductive
Respiratory
Skeletal
Integumentary
1) Circulatory System
Major Structures:
Heart, Blood vessels, Blood
(cardiovascular), lymph nodes and
vessels, lymph (lymphatic)
Functions:
Transports nutrients, wastes,
hormones, and gases
2) Digestive System
Major Structures:
Mouth, Throat, Esophagus, Stomach,
Liver, Pancreas, Small intestine,
Large intestine
Functions:
Extracts and absorbs nutrients from
food; removes wastes; maintains
water and chemical balances
3) Endocrine System
Major Structures:
Hypothalamus, pituitary, pancreas
Functions:
Regulates body temperature,
metabolism, development, and
reproduction; maintains homeostasis;
regulates other organ systems
4) Excretory System
Major Structures:
Kidneys, urinary bladder, ureters,
urethra, skin, lungs
Functions:
Removes wastes from blood;
regulates concentration of body fluids
5) Immune System
Major Structures:
White blood cells, lymph nodes and
vessels, skin
Functions:
Defends against pathogens and
disease
6) Integumentary System
Major Structures:
Skin, nails, hair
Functions:
Protects against injury, infection, and
fluid loss; helps regulate body
temperature
7) Muscular System
Major Structures:
Skeletal, smooth, and cardiac muscle
tissues
Functions:
Moves limb and trunk; moves
substances through body; provides
structure and support
8) Nervous System
Major Structures:
Brain, spinal cord, nerves, sense
organs
Functions:
Regulates behavior, maintains
homeostasis; regulates other organ
systems; controls sensory and motor
functions
9) Reproductive System
Major Structures:
Testes, penis (males), ovaries,
uterus, breasts (females)
Functions:
Produces gametes and offspring
10) Respiratory System
Major Structures:
Lungs, nose, mouth, trachea
Functions:
Moves air into and out of the lungs;
controls gas exchange between
blood and lungs
11) Skeletal System
Major Structures:
Bones and joints
Functions:
Protects and supports the body and
organs; interactions with skeletal
muscles; produces red blood cells,
white blood cells, and platelets
* We’ll be taking a look at how all
the systems must work together
as one unit for the human body to
function properly.
* In health class, you’ll be taking
a look at the problems that can
arise in each of the organ
systems.