1. The _______________ division of the respiratory system exchangesgases with the blood, while the _______________ division only carries air to and from the former.

2. The nasal _______________divides the nasal cavity into right and left chambers called the nasal _______________.

3. The superior opening into the larynx, called the _______________, is sealed during swallowing by a tissue flap calledthe _______________.

4. Each lobe of the lung receives air from one _______________; thus thereare three of these for the right lung and two of them for the left.

5. Resistance to airflow is adjusted mainly at the level of the _______________, which havesmooth muscle but no cartilage in their walls.

6. Gas exchange occurs across the walls of minute air sacs called _______________.

7. We inhale as long as a group of brainstem neurons called the _______________ sendssignals to the diaphragm and external intercostal muscles.

8. Inspiration occurs when the pressure between the parietal andvisceral _______________ is lower than the atmospheric pressure outside the body.

9. The maximum amount of air you can voluntarily inhale and exhaleis called your _______________.

10. The value in the preceding question, among others, can bemeasured with a device called a/an _______________.

11. Difficulty breathing is called _______________ and the heavy breathing thatoccurs during exercise is called _______________.

12. A secretion called _______________ prevents the pulmonary alveoli from collapsing duringexpiration.

13. _______________ law describes the factors that determine how much gas willdissolve in a liquid such as the blood plasma.

14. _______________ coupling is the adjustment of pulmonary airflow and bloodflow to each other.

15. Most CO₂ in the blood chemically reacts with water, especiallyin the RBCs where there is an enzyme, _______________,that catalyzes this reaction.

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