Which of the following pressure gradients is responsible for the actual flow of gas into and out of the lungs during breathing?
a. Transcanadian pressure gradient (Ppc – Pks)
b. Transpulmonary pressure gradient (Palv – Ppl)
c. Transrespiratory pressure gradient (Palv – Pao)
d. Transthoracic pressure gradient (Ppl – Pbs)
ANS: C
The transrespiratory pressure gradient causes gas to flow into and out of the alveoli during breathing.
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