Respiratory Tract

3. warms,humidify,and filters inhaled air
4. the smallest airway in the respiratory tract
6. Splits the trachea into two airways
8. contains three pairs of tonsils
9. commonly known as the voice box
12. air flow resistance is higher in ____ flow
13. an organized flow of air
15. hairy structure that moves debris up and out of the airways
17. the respiratory tract is divided into the upper and ___ respiratory tracts
18. the primary muscle that pushes air in and out of the lung

1. a leaf shaped flap that prevents food from entering the respiratory tract
2. a diatomic gas with a molar mass of 32
5. curved bones within the nasal cavity
7. common viral infection of the respiratory tract
10. a chronic inflammatory disease of the airways
11. is composed by rings of cartilage connected by smooth muscle
12. lymphoid organs which serves as the immune system's first line of defense
14. tiny balloon shaped air sacs that uptakes oxygen
16. the only human organ that can float on water
19. the involuntary contraction of the diaphragm that causes a brief closure of the vocal cord