Which of the following causes gas to flow into and out of the alveoli during breathing?
a. Transrespiratory system pressure (PTR)
b. Intrapleural pressure (Ppl)
c. Transpulmonary pressure (PTP)
d. Transmural pressure (Ptm)
ANS: A
Transrespiratory pressure (PTR) gradient causes gas to flow into and out of the alveoli during breathing.
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