Oxygen and carbon dioxide are exchanged:
A) During inspiration and expiration
B) During inhalation and exhalation
C) Between the alveoli and capillaries
D) At the pharynx and larynx

Question

Quizplus · Accepted Answer

Oxygen and carbon dioxide are exchanged between the alveoli (tiny air sacs in the lungs) and capillaries (small blood vessels). This exchange occurs through the process of diffusion, where oxygen from the air in the alveoli moves into the capillaries to be transported throughout the body, and carbon dioxide from the capillaries moves into the alveoli to be exhaled. The other options (A, B, and D) all involve respiration, but do not specifically refer to the exchange of oxygen and carbon dioxide.

Oxygen and Carbon Dioxide Are Exchanged