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 recoil of elastic fibers that were stretched during inspiration and the inward pull of surface tension due to the film of alveolar fluid
B) the expansion of respiratory muscles that were contracted during inspiration and the lack of surface tension on the alveolar wall
C) the negative feedback of expansion fibers used during inspiration and the outward pull of surface tension due to surfactant
D) combined amount of CO2 in the blood and air in the alveoli
A) the recoil of elastic fibers that were stretched during inspiration and the inward pull of surface tension due to the film of alveolar fluid
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About 75% of the minerals in the body are in bones and teeth, and include calcium and phosphorus. Homeostatic mechanisms regulate their concentrations.
Answer the following statement true (T) or false (F)
A nerve cell membrane becomes depolarized as a result of
A) calcium leaving the nerve cell. B) some ion channels being opened while others are closed. C) Na+ being prevented from passing through the membrane. D) the relative ease with which K+ diffuses into the nerve cell.
Which two processes function in the repair of injured tissue?
A. Edema and clotting B. Necrosis and replacement C. Regeneration and replacement D. Edema and regeneration E. Necrosis and atrophy
The unit of measurement for pressure specifically preferred by many respiratory therapists is
A) mm Hg. B) torr. C) cm H2O. D) All of the answers are correct. E) None of the answers is correct.