Which of the following is true regarding normal quiet expiration of air? A) It depends on the complete lack of surface tension on the alveolar wall. B) It is a passive process that depends on the recoil of elastic fibers that were stretched during inspiration. C) It requires contraction of abdominal wall muscles. D) It is driven by increased blood CO₂ levels.

Question

Quizplus · Accepted Answer

Normal quiet expiration of air is a passive process that relies on the elastic recoil of the stretched lung tissue and chest wall. When the inspiratory muscles relax, the elastic fibers recoil, and the chest and lungs return to their resting volume, expelling air from the lungs. Choices A, C and D are incorrect as they do not describe the mechanism of normal quiet expiration.

Which of the Following Is True Regarding Normal Quiet Expiration