Which of the following pressures vary throughout the normal breathing cycle? 1. Alveolar pressure (Palv) 2. Body surface pressure (Pbs) 3. Mouth pressure (Pao) 4. Pleural pressure (Ppl)
a. 1, 2, 3, and 4
b. 2, 3, and 4 only
c. 2 and 4 only
d. 1 and 4 only
ANS: D
Alveolar pressure (Palv), often referred to as intrapulmonary pressure, varies during the breathing cycle. Ppl also varies during the breathing cycle.
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