Why does exchange of gases between the blood and body tissue not occur to the walls of arteries?

Gas exchange between blood and body tissues primarily occurs in the capillaries, not in the walls of arteries, due to the structural differences. Arteries have thick, muscular walls designed to withstand high pressure and facilitate blood flow, which limits the permeability necessary for gas diffusion. In contrast, capillaries have thin walls composed of a single layer of endothelial cells, allowing for efficient exchange of oxygen, carbon dioxide, and other substances between blood and tissues. This specialized structure of capillaries is essential for meeting the metabolic needs of the surrounding tissues.