The primary effect of increased PO2 in the lungs is to cause ________ which ________ the ventilation-perfusion ratio back to a normal level.
A) vasoconstriction : increases
B) vasodilation : decreases
C) vasoconstriction : decreases
D) bronchoconstriction : decreases
E) bronchodilation : increases
Ans: B) vasodilation : decreases
Biology & Microbiology
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