Respiratory System

2. chemoreceptors in medulla oblongata are sensitive to the changes in this ion's concentration
3. inspiration is known as the ______ phase of ventilation
5. nerve that signals the diaphragm and external intercostal muscles
7. during inhalation, the diaphragm _____.
8. pressure within the alveoli
10. cellular respiration transports gases to cells for
11. the shorter primary bronchus
13. double-layered serous membrane enclosing each lung
15. the nose, pharynx, and larynx are part of the ______ respiratory tract.
17. exchange of gases between blood and tissue fluid
19. secondary respiratory control center
20. part of pharynx that only allows the passage of air
22. lung volume ______ during expiration

1. sneezing, hiccuping, and sighing are known as this type of air movement
4. commonly called the windpipe
6. exchange of oxygen and carbon dioxide between air and blood
9. during exhalation, the intercostal muscles _____.
12. primary respiratory control centre
14. prevents food and water from going down the lower respiratory tract
16. an important function of the respiratory system is to regulate blood ____.
18. the left lung has ____ lobes
21. expiration is known as the _____ phase of ventilation.