Which of the following would you expect to occur if perfusion to an area of the lung remained constant, but VA to this same area decreased?
a. The PACO2 should fall.
b. The HCO3– will fall.
c. The PAO2 should fall.
d. The ventilation/perfusion ratio () should rise.
ANS: C
A low / indicates that ventilation is less than normal, perfusion is greater than normal, or both. In areas with a low /, the alveolar PO2 is lower and the PCO2 is higher than normal.
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