Which of the following statements about the respiratory membrane is true?
a. the membrane consists of the fusion of the simple squamous epithelia of an alveolus with the endothelium of a pulmonary capillary
b. the membrane is very thin, approximately 0.5 micrometers
c. oxygen and carbon dioxide diffuse quickly because of the large surface area of the respiratory membrane
d. all of the listed statements are true
Ans: d. all of the listed statements are true
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