For healthy individuals at rest, which of the following statements about exhalation is true?
a. Exhalation will be passive, due to inspira-tory stored potential energy.
b. Exhalation will only require 40% of the energy expended for inspiration.
c. Exhalation will be the result of accessory respiratory muscle use.
d. Exhalation will generally take half the time of inspiration.
ANS: A
During normal quiet breathing, inhalation is active and exhalation is passive. The work of exhal-ing is recovered from potential energy "stored" in the expanded lung and thorax during inhala-tion.
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