Body Systems

1. mature bone cells which help continue new born formation
5. separates the right atrium from the right ventricle
6. is a short loop from the heart to the lungs and back again
10. the airtight box that houses the bronchial tree, lungs, heart, and other structures.
11. is the solid, hard outside part of the bone
12. the only voluntary muscle tissue in the human body—it is controlled consciously.
15. fluid this fluid helps protect the nerve tissue, keep it healthy, and remove waste products.
17. moves downward toward the abdomen, and the rib muscles pull the ribs upward and outward
18. a network of tiny blood vessels that connects the very small artery branches to very small veins.

2. move in many directions.
3. a flexible, rubbery substance in our joints, supports bones and protects them where they rub against each other.
4. the brain by the bones of the skull, and the spinal cord by a set of ring-shaped bones
5. the continuation of the airway below the larynx
7. separates the left atrium from the left ventricle
8. store calcium and release some into the bloodstream when it's needed by other parts of the body
9. contains the information that essentially makes you who you are
12. a long bundle of nerve tissue about 18 inches long and 1/2-inch thick.
13. is found in the heart. The walls of the heart's chambers are composed almost entirely of muscle fibers
14. allow movement in one direction, as seen in the knees and elbows.
16. This short tube contains a pair of vocal cords, which vibrate to make sounds.