Respiratory System

3. the act of taking air into the lungs and expelling waste gases from the lungs
4. plant structure through which a plant "breathes"
7. a flap if tissue that covers the windpipe to keep food and water from entering it
9. the life process by which energy is released by cells
10. the back of the throat; connects the mouth with the windpipe
12. the breathing apparatus for fish and tadpoles
14. tiny holes on the abdomen of insects through which they breathe
15. that part of the throat that contains the voice box
16. the muscle that contracts and relaxes thereby causing one to inhale and exhale
19. scientific name for the windpipe
20. the main organ of the respiratory system

1. vibrations of these result in sound or speech
2. of theses result in sound or speech
5. the most abundant gas in the air we breathe
6. gas that is exhaled by mammals as part of respiration
8. main branch of the respiratory tract leading into the lungs
11. microscopic hair-like structures in the respiratory tract
13. the tube that carries food from the mouth to the stomach
17. tiny air sacs in the lungs where oxygen and carbonxdioxide are exchanged
18. a sticky substance that lines the respiratory tract
21. given off as a waste product by green plants; essential for our survival