Movement of Oxygen and Carbon Dioxide Between Alveoli and Blood

Question

Movement of oxygen and carbon dioxide between alveoli and blood occurs by what process?
A) facilitated diffusion
B) osmosis
C) simple diffusion
D) primary active transport
E) secondary active transport

Accepted Answer

The movement of oxygen and carbon dioxide between alveoli and blood occurs through simple diffusion, which is driven by the concentration gradients of these gases across the alveolar-capillary membrane.