Respiratory System

2. scientific name for the windpipe
3. the most abundant gas in the air we breathe
6. microscopic hair-like structures in the respiratory tract
7. the life process by which energy is released by cells
10. vibrations of these result in sound or speech
11. the tube that carries food from the mouth to the stomach
13. of theses result in sound or speech
15. the back of the throat; connects the mouth with the windpipe
17. a sticky substance that lines the respiratory tract
19. that part of the throat that contains the voice box
20. the muscle that contracts and relaxes thereby causing one to inhale and exhale

1. main branch of the respiratory tract leading into the lungs
4. given off as a waste product by green plants; essential for our survival
5. gas that is exhaled by mammals as part of respiration
8. the breathing apparatus for fish and tadpoles
9. the main organ of the respiratory system
11. a flap if tissue that covers the windpipe to keep food and water from entering it
12. the act of taking air into the lungs and expelling waste gases from the lungs
14. tiny holes on the abdomen of insects through which they breathe
16. tiny air sacs in the lungs where oxygen and carbonxdioxide are exchanged
18. plant structure through which a plant "breathes"