Question

multiple choice question
which statement describes the net movement of carbon dioxide during internal respiration?
carbon dioxide diffuses from the tissues to the blood.
carbon dioxide moves in the same direction as oxygen.
carbon dioxide diffuses from the blood to the tissues.

Explanation:

During internal respiration, oxygen diffuses from the blood to the tissues for cellular respiration. As a by - product of cellular respiration, carbon dioxide is produced in the tissues. Since there is a higher concentration of carbon dioxide in the tissues compared to the blood, carbon dioxide diffuses down its concentration gradient from the tissues to the blood. Oxygen and carbon dioxide move in opposite directions during internal respiration.

Answer:

Carbon dioxide diffuses from the tissues to the blood.