Respiratory System

4. A muscle that helps to raise the sternum is..........
7. What is the primary function of the respiratory system?
9. Physical, cellular and ............... mechanism are the 3 series of defense mechanisms.
10. is used to decrease surface tension in alveoli.
12. What is the most common disease involving the respiratory system?
14. Number of capillaries ............ are one of the factors that affect the delivery of oxygen and removal of carbon dioxide.
15. The ................ of diffusion can explain the factors affecting gaseous exchange.

1. What is the respiratory muscle involved during quiet breathing?
2. Type I pneumocytes compose of single layer of thin and ............. cell
3. Gaseous exchange occurs mainly by a process called ................ spontaneously.
5. A process by which air enters and leaves the lung.
6. Thorax is one of respiratory system structures other than ................
8. ................ is a tiny hairs in the nasal cavity that help mucus to be blown out from the nose.
11. What is the mechanism of breathing when the rib cage moves upward and outward, and the diaphragm expands and moves down?
13. Respiratory system gets protection & support from ................