Which of the following is not one of the four mechanisms responsible for exchange in capillaries and sinusoids

Question

Quizplus · Accepted Answer

Primary active transport is not a mechanism for exchange in capillaries and sinusoids. The four main mechanisms are diffusion across the capillary endothelial cells, diffusion through gaps between adjacent endothelial cells, diffusion through the pores in fenestrated capillaries and sinusoids, and vesicular transport by endothelial cells. Primary active transport refers to the movement of molecules against their concentration gradient, which is not supported by capillaries and sinusoids.

Which of the Following Is Not One of the Four