If the epithelium that lines the air sacs of your lungs were to gain a layer of cells, which of the following would likely occur to the rate of oxygen diffusion?
A) Oxygen will diffuse across the lung surface more quickly.
B) Oxygen will diffuse across the lung surface more slowly.
C) Oxygen will diffuse across the lung surface out of, instead of into, the body.
D) Oxygen will diffuse across the lung surface at a normal rate because it is only the shape of the cells that affect diffusion rate.

Question

Quizplus · Accepted Answer

Adding a layer of cells to the epithelium lining the air sacs of the lungs would increase the diffusion distance that oxygen must travel to reach the bloodstream. This increased distance would slow down the rate of oxygen diffusion.

If the Epithelium That Lines the Air Sacs of Your