Oxygen and carbon dioxiode 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 molecules that can easily diffuse across the capillary walls and into the interstitial fluid based on their concentration gradients. There is no need for active transport, exocytosis, endocytosis, or pinocytosis.

Oxygen and Carbon Dioxiode Are Transported Between the Blood and Interstitial