Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by ________.
A) osmosis
B) diffusion
C) filtration
D) active transport

Question

Quizplus · Accepted Answer

Oxygen and carbon dioxide are small, non-polar molecules that can easily move across cell membranes through diffusion, which is the passive movement of molecules from an area of high concentration to an area of low concentration. Osmosis is the diffusion of water molecules, not gas molecules. Filtration and active transport require energy and specific channels or pumps, which are not necessary for the exchange of gases like oxygen and carbon dioxide.

Oxygen and Carbon Dioxide Are Exchanged in the Lungs and Through