Respiratory System

2. the process of breathing out air.
6. the inhaling and exhaling of air
9. the process of breathing in air.
11. the exchange of oxygen and carbon dioxide in the body.
13. located below the epiglottis and anterior to, or in front of, the esophagus.
16. a hollow space behind the nose in the middle of the face.
17. very narrow airways in the lungs, less than 1 mm in diameter. They connect the bronchi to the alveoli.
18. allows the respiratory system to meet increased oxygen demands during high stress or extreme circumstances

1. small air sacs; each alveolus (singular) is surrounded by a web of capillaries.
3. the primary passageway for air into and out of the respiratory system.
4. larger airways in the lungs that are supported by cartilage rings.
5. soft, spongy organs located in the thoracic cavity that are responsible for gas exchange.
7. a network of organs and tissues that help the body take in oxygen and expel waste gases.
8. a small, leaf-like flap of cartilage at the bottom of the pharynx.
10. the process of supplying oxygen to cells that takes place during external respiration.
12. located behind the nasal cavity and mouth.
14. a thin, slippery double membrane that surrounds each lung and lines the inner surfaces of the thoracic cavity. Pleural fluid reduces friction on lungs during breathing.
15. marks the beginning of the lower respiratory tract and extends from the cricoid cartilage to the carina.