Internal Respiration Refers To

Question

Internal respiration refers to
A) atmospheric air coming into the lungs.
B) gas exchange between the lungs and the blood.
C) gas exchange in the atmosphere.
D) gas exchange between the blood and body tissues.
E) cellular respiration.

Accepted Answer

Internal respiration refers to the exchange of gases between the blood in the capillaries and the body tissues during cellular respiration, where oxygen is delivered to the cells and carbon dioxide is removed. It is not related to atmospheric air coming into the lungs or gas exchange in the atmosphere. Gas exchange between the lungs and the blood is referred to as external respiration.