In the lungs, which one of the following is NOT a barrier to gas exchange between red blood cells and the alveolar space? - PhysiologyWeb

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Physiology Test Question

In the lungs, which one of the following is NOT a barrier to gas exchange between red blood cells and the alveolar space?

	(A) A fluid layer of water and surfactants covering the luminal surface of alveolar cells
	(B) Basement membranes of endothelial and alveolar cells
	(C) Alveolar cells
	(D) Smooth muscle cells surrounding the endothelial cells
	(E) The plasma membrane of the endothelial cells

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Posted: Thursday, January 1, 2015