Gas exchange occurs in the _____ unit

Question

Quizplus · Accepted Answer

Gas exchange occurs in the alveolar-capillary unit, where oxygen diffuses from the alveoli (tiny air sacs) into the capillaries (small blood vessels) and carbon dioxide diffuses in the opposite direction, from the capillaries into the alveoli. The bronchi and bronchioles are part of the airway system that leads to the alveoli, but gas exchange does not occur in these structures. The bloodstream is involved in transporting oxygen and carbon dioxide, but gas exchange specifically occurs in the alveolar-capillary unit. Gas exchange occurs in the alveolar-capillary unit, which is where oxygen and carbon dioxide are exchanged between the lungs and the blood. The bronchi and bronchioles are responsible for conducting air to and from the lungs, but gas exchange specifically occurs in the alveoli of the lungs. The bloodstream is involved in transportation of gas, but it is not the site of gas exchange itself.

Gas Exchange Occurs in the _____ Unit