Gas exchange between the blood and body tissues. E.g cellular respiration.
Explanation:
As the name implies, internal respiration is the process of diffusing oxygen from the blood into the intestinal fluids and cells. Carbon dioxide is also difussed out.
Oxygen is released from blood cells in response to the oxygen concentration in the capillaries of the blood vessels.
However, cellular respiration is process of converting the oxygen along with glucose into ATP.
