The characteristic that enables efficient gas exchange in capillaries is:
A) the very short total length of the capillaries.
B) their proximity to the heart.
C) thick walls of connective and muscle tissue.
D) thin walls that are only one cell wide.
E) the long total length of the capillaries.

Question

Quizplus · Accepted Answer

Capillaries have thin walls that are only one cell wide, which allows for efficient gas exchange between the blood and the surrounding tissues. This thinness facilitates the diffusion of oxygen and carbon dioxide.

The Characteristic That Enables Efficient Gas Exchange in Capillaries Is