In capillaries, oxygen and carbon dioxide are exchanged by the process of:
A)osmosis
B)phagocytosis
C)filtration
D)diffusion

Question

Quizplus · Accepted Answer

Capillaries are thin and narrow blood vessels that allow for the exchange of gases and nutrients between the blood and body tissues. In capillaries, oxygen and carbon dioxide are exchanged by the process of diffusion, which is the movement of molecules from an area of high concentration to an area of low concentration. This process occurs because the concentration of oxygen and carbon dioxide is higher in the blood than in the body tissues, and so these gases diffuse across the capillary walls to reach their respective destinations. Osmosis is the movement of water across a semi-permeable membrane, phagocytosis is the engulfing of particles by cells, and filtration is the movement of fluids and solutes across a membrane under pressure.

In Capillaries, Oxygen and Carbon Dioxide Are Exchanged by the Process