During normal inspiration, which of the following occurs?
a. Alveoli at the apexes expand less than those at the bases.
b. Alveoli at the apexes expand more than those at the bases.
c. Alveoli at the bases and apexes expand almost equally.
d. Alveoli at the bases expand less than those at the apexes.
ANS: A
Like perfusion, ventilation also is increased in the lung bases, with approximately four times as much ventilation going to the bases than to the apexes of the upright lung.
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