Vocab Review

7. the lower two chambers of the heart.
8. microscopic sacs or pouches at the end of the bronchioles where gas exchange occurs.
10. two narrow tubes that carry air into the lungs from the trachea.
12. the upper two chambers of the heart.
13. a tiny blood vessel that delivers supplies to an individual cell and takes away waste materials.
14. ______ nervous system system made up of the brain and the spinal cord.
16. the basic functioning unit of the nervous system; a nerve cell.

1. special structures in all parts of the sensory system that detect stimuli.
2. a tube that is held open by C-shaped rings of cartilage; connects the larynx and the bronchi.
3. a vessel that carries blood toward the heart.
4. system the part of your nervous system that detects or senses the environment.
5. a tubelike passageway at the top of the throat that receives air, food, and liquids from the mouth or nose.
6. tubelike structure of neurons that sends signals to and from the brain (2 words).
9. a vessel that carries blood away from the heart.
11. a large muscle below the lungs that contracts and relaxes as air moves into and out of your lungs.
15. the main organs of the respiratory system.
16. ______ system the part of an organism that gathers, processes, and responds to information.