Oxygen and carbon dioxide are transported between the blood and interstitial fluid by way of
A) exocytosis and endocytosis by endothelial cells.
B) pinocytosis using fluid-filled vesicles.
C) diffusion from areas of higher concentration to lower concentration.
D) active transport (using ATP) by protein carriers of endothelial cells.

Question

Quizplus · Accepted Answer

Oxygen and carbon dioxide are small, nonpolar molecules that can easily diffuse across cell membranes from areas of higher concentration to areas of lower concentration, which is how they are transported between the blood and interstitial fluid.

Oxygen and Carbon Dioxide Are Transported Between the Blood and Interstitial