Which of the following is an example of diffusion?
A)inhalation of air into the lungs
B)build-up of carbon dioxide in the cells
C)warming and moistening of inhaled air before it passes to the alveoli
D)passage of oxygen from the alveoli to the blood

Question

Quizplus · Accepted Answer

Diffusion is the movement of particles from an area of high concentration to an area of low concentration. In this case, oxygen moves from the high concentration in the alveoli (where inhaled air is exchanged with carbon dioxide) to the low concentration in the blood. A is incorrect because inhalation requires muscle action and is not a passive process. B is incorrect because the build-up of carbon dioxide in cells is due to cellular respiration, not diffusion. C is incorrect because warming and moistening of inhaled air is due to physical processes, not diffusion.

Which of the Following Is an Example of Diffusion