What happens during normal inspiration? 1. The Ppl increases further below atmospheric pressure. 2. The transpulmonary pressure gradient widens. 3. Palv drops below that at the airway opening
a. 1 and 2 only
b. 2 and 3 only
c. 1 only
d. 1 and 3 only
ANS: B
As the alveoli expand, their pressures fall below the pressure at the airway opening. This "nega-tive" (i.e., sub-atmospheric) transrespiratory pressure gradient causes air to flow from the airway opening to the alveoli, increasing their volume.
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