1. Human Body Systems Review
Structures, Functions, and Interactions

2. Digestive
Structures: Mouth, esophagus, liver, stomach, gallbladder, pancreas, large intestines, small intestines, rectum Function: breaks down food into molecules the body can use, and eliminates waste Interactions: Uses the circulatory system to take food to the individual cells, forms the end of the excretory system to expel solid waste.

3. Digestive

4. Circulatory or Cardiovascular
Structures: Heart, blood vessels Functions: Heart pumps blood through all blood vessels. Interactions: Highway system of the body, carries food (digestive) and oxygen (respiratory) to the cells and carries waste away.

5. Cardiovascular

6. Nervous
Structures: brain, spinal column, nerves. Functions: detects & interprets info from inside and outside the body; control center Interactions: Tells muscles to contract (voluntary), tells heart to pump (involuntary)

7. Nervous

8. Excretory or Urinary
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) Interactions: Cleans waste from the circulatory system and digestive system

9. Urinary

10. Respiratory
Structures: Nose, Lungs, Wind Pipe Function: Moves oxygen into the body and removes carbon dioxide and water from the body. Interactions: Circulatory system carries oxygen to the cells and carbon dioxide away.

11. Respiratory

12. Skeletal
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).

13. Skeletal

14. Muscular
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

15. Muscular

16. Endocrine
Organs: glands, hypothalamus, thyroid, ovaries, testes Functions: Sends out chemical messages Interactions: Sends growth hormones to skeletal system.

17. Endocrine

18. Immune
Structures: white blood cells, skin, stomach, phagocytes, lymphocytes Function: defends the body against germs and microorganisms Interactions: All systems, Lymphatic system gets rid of bacteria and viruses

19. Immune