Respiratory System

2. warms, moistens, & filters air as it is inhaled
4. a slimy substance produced in the nose and throat to moisten and protect them
5. a cartilaginous structure at the top of the trachea, enable speech
6. tiny sacs of lung tissue specialized for the movement of gases between air and blood
7. the act of expelling air from the lungs
8. When this muscle contracts, it moves down helping the lungs expand for inhalation
10. small tubes that branch off the bronchi that contain clusters of alveoli at each end.
13. Two short branches located at the lower end of the trachea that carry air into the lungs.
14. The windpipe
17. the act of inhaling
18. two spongy organs, located in the rib cage, responsible for respiration
19. a flap of cartilage that covers the windpipe while swallowing

1. process that releases energy from food in the presence of oxygen
3. A gas that is brought into the body
9. The fine hairlike projections from certain cells that help to sweep away fluids and particles
11. A gas that exits from the body
12. voice box; passageway for air moving from pharynx to trachea; contains vocal cords
15. the act of exhaling air suddenly with a noise
16. tiny, thin-walled blood vessels that allow the exchange of gases and nutrients between the blood and the cells of the body