Human Body Systems

3. What layer of skin contains its own blood supply?
6. What is the largest single organ of your body?
9. Is a type of circulation and is from the heart to the heart muscle itself.
11. The organs that make up this system are the mouth, nose, trachea, lungs, and diaphragm.
13. What organ is responsible for absorbing most nutrients?
14. There are over 650 of these in the human body.
17. This muscle controls all motor activities and is under your voluntary control.
20. Where does digestion begin?
21. Where is the pineal gland found?
22. How many body systems are there?

1. Is all other nerves.
2. Where are the sperm produced?
4. What system has the following glands: hypothalamus, pituitary, & thyroid?
5. This muscle is found in the hollow organs and contract in order to reduce the size of the organ and create force or movement.
7. Is a type of circulation and is all other arteries and veins.
8. Is the spinal cord and brain.
10. There are exactly 206 of these in the human body.
12. What system is responsible for fighting off infection & disease?
15. This muscle is found in the heart and it is distinctive in that it contracts automatically & regularly.
16. Is a type of circulation and is from the heart to the lungs and back again.
18. Which organ is most important to the excretory system?
19. During a menstrual cycle is when a mature _______ is released.