What phrase describes the condition in which a series of alveoli in the left lower lobe receive ad-equate ventilation but lack adequate perfusion?
a. A right-to-left shunt
b. Alveolar dead space
c. A low ventilation-perfusion ratio
d. Pulmonary hypotension
ANS: B
When certain areas of the alveoli experience inadequate perfusion, it is referred to as dead space. The situation is not referred to as either a right-to-left shunt or as pulmonary hypotension. Shunt-ing is due to a low ventilation-perfusion ratio.
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