Respiratory System

3. the tube that carries food from the mouth to the stomach
6. the breathing apparatus for fish and tadpoles
7. the act of taking air into the lungs and expelling waste gases from the lungs
9. plant structure through which a plant "breathes"
10. main branches of the respiratory tract leading into the lungs
12. the life process by which energy is released by cells
13. the back of the throat; connects the mouth with the windpipe
14. vibrations of these result in sound or speech
16. a flap if tissue that covers the windpipe to keep food and water from entering it
20. the muscle that contracts and relaxes thereby causing one to inhale and exhale
21. microscopic hair-like structures in the respiratory tract

1. a sticky substance that lines the respiratory tract
2. the main organ of the respiratory system
4. tiny holes on the abdomen of insects through which they breathe
5. of theses result in sound or speech
8. the most abundant gas in the air we breathe
11. gas that is exhaled by mammals as part of respiration
15. tiny air sacs in the lungs where oxygen and carbonxdioxide are exchanged
17. scientific name for the windpipe
18. given off as a waste product by green plants; essential for our survival
19. that part of the throat that contains the voice box