Body systems

3. an involuntary muscle
4. This type of muscle is attacked to the bones
6. The basic workings of the nervous system depend a lot on tiny cells called
8. type of muscle found in the heart
10. bones store it and release it to the bloodstream
11. voluntary muscles are controlled by the
14. move body parts by contracting and relaxing
16. This protects the brain
18. joints that rotate or twist
19. Olfactory cells in the mucous membranes lining each nostril react to chemicals you breathe in and send messages along specific nerves to the brain.
20. the type of joint that only moves in one direction

1. underneath the middle of the forebrain, acts as a master coordinator for all the messages going in and out of the brain to the spinal cord.
2. where two bones meet
5. Tiny sacs at the end of bronchioles
7. Another name for windpipe
9. carries messages form the sensory organs
12. The exchange of oxygen and carbon dioxide
13. Voice box
15. Tiny hairs in the nose
17. another name for involuntary muscles
19. Light entering the eye forms an upside-down image on the retina. The retina transforms the light into nerve signals for the brain.