External Respiration Involves The

Question

External respiration involves the
A) movement of air into and out of the lungs.
B) diffusion of gases between the interstitial fluid and the external environment.
C) exchange of dissolved gases between the cells and interstitial fluids.
D) binding of oxygen by hemoglobin.
E) utilization of oxygen by tissues to support metabolism.

Accepted Answer

External respiration refers to the exchange of gases between the alveoli in the lungs and the blood in the pulmonary capillaries, which involves the diffusion of oxygen from the alveoli into the blood and carbon dioxide from the blood into the alveoli.