Proximity of Capillaries to Tissue Cells Is Crucial Because

Multiple Choice

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.