1. Structures, Functions, and Interactions

3. Structures: Structures: Mouth, esophagus, liver, stomach, gallbladder, pancreas, large intestines, small intestines, rectum Function: Function: breaks down food into molecules the body can use, and eliminates waste

5. Structures: kidney, urinary bladder, urethra, anus, large intestines Functions: Blood is filtered through the kidneys and removed from the body. (Urinary) Unused digested foods are removed through the anus (Excretory)

7. Structures: Nose, Lungs, Wind Pipe Function: Moves oxygen into the body and removes carbon dioxide and water from the body.

9. Structures: Heart, blood vessels Functions: Heart pumps blood through all blood vessels.

11. Structures: brain, spinal column, nerves. Functions: detects & interprets info from inside and outside the body; control center

13. Organs: glands, hypothalamus, thyroid, ovaries, testes Functions: Sends out chemical messages

15. Structures: bones, cartilage, joints, marrow Functions: provides shape and support, enables you to move, protects your internal organs Interactions: bones make your red blood cells (cardiovascular).

17. Structures: skeletal muscle, smooth muscle, and cardiac muscle Functions: Involuntary muscles are responsible for activities such as breathing and digesting food; Voluntary muscles are under your control Interactions: All systems, all of your organs are made of muscle

19. Structures: white blood cells, skin, stomach, phagocytes, lymphocytes Function: defends the body against germs and microorganisms

21. Structures: skin, hair, nails, sweat glands Function: retain body fluids, protect against disease, eliminate waste products, and regulate body temperature

22. Homeostasis is how the body maintains equilibrium (balance), or a stable state of healthy function.