Respiratory System

1. scientific name for the windpipe
5. the act of taking air into the lungs and expelling waste gases from the lungs
7. tiny air sacs in the lungs where oxygen and carbonxdioxide are exchanged
12. the back of the throat; connects the mouth with the windpipe
13. gas given off as a waste product by green plants; essential for our survival
16. the breathing apparatus for fish and tadpoles
19. a sticky substance that lines the respiratory tract
20. the most abundant gas in the air we breathe
21. plant structure through which a plant "breathes"

2. microscopic hair-like structures in the respiratory tract
3. the tube that carries food from the mouth to the stomach
4. main branch of the respiratory tract leading into the lungs
6. the life process by which energy is released by cells
8. vibrations of these result in sound or speech
9. vibrations of theses result in sound or speech
10. gas that is exhaled by mammals as part of respiration
11. tiny holes on the abdomen of insects through which they breathe
14. the muscle that contracts and relaxes thereby causing one to inhale and exhale
15. a flap if tissue that covers the windpipe to keep food and water from entering it
17. the main organ of the respiratory system
18. that part of the throat that contains the voice box