Respiratory System

3. This cell in the trachea produces mucus.
7. The three unpaired pieces of cartilage in the larynx are: Thyroid, epiglottis and the ______.
9. What does alveolar cells secrete?
15. Grapelike outpouchings of epithelium and elastic basement membrane surrounded by a network of capillaries.
16. A passageway that extends from the cricoid cartilage to the fifth thoracic vertebra.
17. The respiratory system works together with the __________ system to supply oxygen and eliminate carbon dioxide.
18. Functional residual _____ is the volume of gas in the lungs at the end of a normal tidal volume exhalation.
19. Paired, cone-shaped organs located in the pleural cavity
20. what is the upper most part of the pharynx called?
22. The exchange of gases between the lungs and blood.

1. The primary bronchi divide to form these smaller bronchi.
2. What stimuli detects the sense of smell?
4. This muscle moves downward when it contracts for breathing.
5. What are the anterior portions of the nasal cavities, just inside the nostrils called?
6. Terminal bronchiole subdivide into respiratory __________.
8. This separates the right and left nasal cavities.
10. What is another name of alveolar ducts?
11. This is the cavity the lungs are located in.
12. Tension on the true vocal cords controls the _____ of sound.
13. opening in the oropharynx that connect with the mouth
14. What structure is between the pharynx and the trachea?
21. As we age, lung tissue becomes less elastic and more ______.