With the exception of the brain,how are materials exchanged across capillary walls elsewhere in the body?

Question

Quizplus · Accepted Answer

Materials are exchanged across capillary walls elsewhere in the body mainly by diffusion, which is the passive movement of molecules from an area of higher concentration to an area of lower concentration. This process is facilitated by the thin walls of capillaries, which allow for easy diffusion of small molecules such as oxygen and carbon dioxide. Other factors that influence diffusion include the concentration gradient, distance, and the permeability of the membrane. Carrier-mediated transport and active protein carriers are more common in the transport of larger or charged molecules, while capillary shuttles and membrane binding are not major mechanisms for material exchange across capillaries.

With the Exception of the Brain,how Are Materials Exchanged Across