Question

Exchange of nutrients, gases, and waste molecules occurs across capillary walls. fluid is also exchanged. most of the fluid is moved by ____________ which, in turn, is due to the pressure differences between the capillary fluid and interstitial fluid.

Answer 1

The correct answer is filtration.

The small molecules can cross in and out of the capillaries through facilitated or simple diffusion. However, the majority of the flow of capillary and tissue fluid takes place through the process of filtration and reabsorption. Filtration refers to the movement of the fluid out of the capillaries and is mediated by the capillary hydrostatic pressure.