What physiology is present at the base of the lungs?
a. Arterial perfusion pressure is less than that of alveolar gas pressure.
b. Arterial perfusion pressure and alveolar gas pressure are less than they are at the apex.
c. Arterial perfusion pressure exceeds alveo-lar gas pressure.
d. Arterial perfusion and alveolar gas pres-sure are equal.
ANS: C
In the base of the lungs, both arterial and venous pressures are greater than alveolar pressure, and blood flow is not affected by alveolar pressure. It is in the apex that alveolar pressure exceeds pulmonary arterial and venous pressures. In zone II, also part of the apex, alveolar pressure is greater than venous pressure, but not arterial pressure.
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