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Question
What are the middle three layers (4-5-6) that an oxygen molecule must cross when moving from the alveoli into the blood?a. interstitial space, basement membrane of the capillary endothelium, and the capillary endothelium
b. the liquid lining the intra-alveolar membrane, alveolar epithelial cell, and the basement membrane of the alveolar epithelial cell
c. interstitial space, basement membrane of the capillary endothelium, and the intracellular fluid of the erythrocyte
d. plasma of the capillary blood, the erythrocyte membrane, and the intracellular fluid in the erythrocyte.
Answer
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