Question

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

A) Carbon dioxide moves into the lungs
B) Carbon dioxide moves out of the lungs
C) Carbon dioxide moves into the bloodstream
D) Carbon dioxide moves into the cells

Answer 1

During internal respiration, carbon dioxide moves from the cells into the bloodstream and is then transported to the lungs to be expelled from the body.

Step-by-step explanation:

The net movement of carbon dioxide during internal respiration is described by the statement that carbon dioxide moves from the cells into the bloodstream. During this process, as oxygen diffuses from the capillaries and into the body cells, carbon dioxide undergoes gas exchange, moving out of the body cells and into the capillaries. This carbon dioxide is then carried via the blood back to the heart and then to the lungs, where it diffuses into the alveoli and is finally released into the air during exhalation.