When the lungs are in the resting position, the factor that opposes their collapse is __________.
a. an intrapulmonary pressure of 5 mm Hg
b. an intrapleural pressure of -4 mm Hg
c. an intrapleural pressure of 760 mm Hg
d. an intrapulmonary pressure of 760 mm Hg
Answer: b. an intrapleural pressure of -4 mm Hg
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