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. diffusion is a slow process.
e. all of these are true.


Answer: d

Biology & Microbiology

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