Which of the following are true about intermittent positive-pressure breathing?
1. During inspiration, pressure in the alveoli decreases.
2. The pressure gradients of normal breathing are reversed.
3. During inspiration, alveolar pressure may exceed pleural pressure.
4. Energy stored during inspiration causes a passive exhalation.
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: D
Ppl may actually exceed atmospheric pressure during a portion of inspiration.
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