The respiratory membrane consists of:
A)the walls of the alveoli and mucous membrane.
B)the walls of the alveoli and capillaries.
C)pulmonary capillary beds.
D)walls of bronchioles and alveoli.

Question

Quizplus · Accepted Answer

The respiratory membrane is the thin barrier that separates the air within the alveoli from the blood within pulmonary capillaries. This membrane is composed of the walls of the alveoli and capillaries. Choice A is incorrect because the mucous membrane does not play a direct role in the gas exchange. Choice C is incorrect because while pulmonary capillary beds are part of the respiratory membrane, they are not the only component. Choice D is incorrect because only the walls of the alveoli are part of the respiratory membrane, not the walls of bronchioles.

The Respiratory Membrane Consists Of