Which of the following is true regarding normal quiet expiration of air?a. It is a passive process that depends on the recoil of
elastic fibers that were stretched during inspiration.b. It depends on the complete lack of surface tension on the alveolar wall.c. It is driven by increased blood CO2 levels.d. It requires contraction of abdominal wall muscles.
The correct answer is option a. "It is a passive process that depends on the recoil of elastic fibers that were stretched during inspiration".
Explanation:
Normal quiet expiration is a passive process that depends on the recoil of elastic fibers that were stretched during inspiration. Expiration is a passive process that only requires of the relaxation of the elastic fibers that comprise the diaphragm muscle, but it depends in the contraction of this muscle that takes places during inspiration.
