Unlike inspiration, expiration is a passive act because no muscular contractions

Question

Unlike inspiration, expiration is a passive act because no muscular contractions are involved. Expiration, however, depends on two factors. Which of the choices below lists those two factors?

a. the negative feedback of expansion fibers used during inspiration and the outward pull of surface tension due to surfactant

b. the expansion of respiratory muscles that were contracted during inspiration and the lack of surface tension on the alveolar wall

c. the recoil of elastic fibers that were stretched during inspiration and the inward pull of surface tension due to the film of alveolar fluid

d. All of the above

e. None of the above

Explanation / Answer

Expiration can be considered to be a passive act.It does not involve any muscular contractions.Expiration however mainly depends on the recoiling of the elastic fibres that were stretched during inspiration. The film of the alveolar fluid further creates an inward pull owing to the surface tension created during expiration. Hence, option c is correct.

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