In Mammals,most Gas Exchange Between the Atmosphere and the Pulmonary

Question

In mammals,most gas exchange between the atmosphere and the pulmonary blood occurs in the
A)trachea.
B)larynx.
C)bronchi.
D)bronchioles.
E)alveoli.

Accepted Answer

The alveoli are tiny air sacs in the lungs where the majority of gas exchange occurs. Oxygen from the inhaled air diffuses into the blood vessels surrounding the alveoli, while carbon dioxide from the blood is released into the alveoli to be exhaled. The trachea, larynx, bronchi, and bronchioles are all involved in conducting air to and from the alveoli, but they do not participate directly in gas exchange.