Internal respiration refers to exchange of oxygen and carbon dioxide between the blood and the
A)alveoli.
B)respiratory bronchioles.
C)alveoli and respiratory bronchioles.
D)tissues and interstitial fluid.
E)conducting portion of the respiratory system.

Question

Quizplus · Accepted Answer

Internal respiration refers to the exchange of oxygen and carbon dioxide between the blood and the tissues and interstitial fluid. This occurs in the capillaries surrounding the tissues. The alveoli and respiratory bronchioles are involved in external respiration, which is the exchange of oxygen and carbon dioxide between the air and the blood in the lungs. The conducting portion of the respiratory system refers to the passageways leading to the alveoli and is not directly involved in gas exchange.

Internal Respiration Refers to Exchange of Oxygen and Carbon Dioxide