Proximity of capillaries to tissue cells is crucial because
A) bulk flow operates to move protein-free plasma through clefts between endothelial cells.
B) red cells have to squeeze single file through capillaries.
C) some proteins exit capillaries by endocytosis and exocytosis.
D) this is where nutrient and waste exchange occur.
E) all of these are true.

Question

Quizplus · Accepted Answer

Capillaries are the smallest blood vessels and are responsible for the exchange of nutrients and waste products between the blood and tissue cells. This exchange occurs due to the close proximity of capillaries to tissue cells. Options A, B, and C are not entirely accurate with respect to the crucial nature of proximity of capillaries to tissue cells.

Proximity of Capillaries to Tissue Cells Is Crucial Because