Question

Which statement describes the net movement of carbon dioxide during internal respiration?

Multiple choice question.
1. Carbon dioxide diffuses from the blood to the tissues.
2. Carbon dioxide diffuses from the tissues to the blood.
3. Carbon dioxide moves in the same direction as oxygen.

Answer 1

Carbon dioxide diffuses from the tissues to the blood during internal respiration due to the gradient in partial pressure.

Step-by-step explanation:

The statement that describes the net movement of carbon dioxide during internal respiration is that carbon dioxide diffuses from the tissues to the blood. Internal respiration involves gas exchange at the tissue level, where oxygen diffuses out of the blood and into the cells, and carbon dioxide produced during cellular respiration diffuses in the opposite direction - from the tissues into the blood. The partial pressure of carbon dioxide is higher in the tissues, which produces a gradient that drives its movement into the blood, where it is ultimately transported back to the lungs for exhalation.

Carbon dioxide diffuses from the tissues to the blood during internal respiration due to a partial pressure gradient.