1. Human Body Systems

2. Human Body Organization
The Human Body
is composed of
Organ Systems
are composed of
Organs
Tissues
Cells

3. Circulatory System Major Structures
heart, blood vessels, blood, lymph nodes and vessels, lymph
Functions
transports nutrients, wastes, hormones, and gases

4. Digestive System Major Structures
mouth, throat, esophagus, stomach, liver, pancreas, small and large intestines
Functions
extracts and absorbs nutrients from food; removes wastes; maintains water and chemical balances

5. Endocrine System Major Structures
hypothalamus, pituitary, pancreas, pineal, adrenal, thyroid, parathyroid, testes, and ovaries
Functions
regulates body temperature, metabolism, development, and reproduction; maintains homeostasis; regulates other organ systems

6. Excretory System Major Structures
kidneys, urinary bladder, ureters, urethra, skin, lungs
Functions
removes wastes from blood; regulates concentration of body fluids

7. Immune System Major Structures
white blood cells, lymph nodes and vessels, skin
Functions
defends against pathogens and diseases

8. Integumentary System Major Structures skin, nails, hair Functions
protects against injury, infection, and fluid loss; helps regulate body temperature

9. Muscular System Major Structures
skeletal, smooth, and cardiac muscle tissues
Functions
moves limbs and trunk; moves substances through body; provides structure and support

10. Nervous System Major Structures
brain, spinal cord, nerves, sense organs
Functions
regulates behavior; maintains homeostasis; regulates other organ systems; controls sensory and motor functions

11. Reproductive System Major Structures
ovaries, uterus, and breasts (in females); testes and penis (in males)
Functions
produces gametes and offspring

12. Respiratory System Major Structures lungs, nose, mouth, trachea
Functions
moves air into and out of lungs; controls gas exchange between blood and lungs

13. Skeletal System Major Structures bones and joints Functions
protects and supports the body and organs; interacts with skeletal muscles; produces red blood cells, white blood cells, and platelets