Question

question
if oxygen concentration is higher in the interstitial fluid than in the cytosol, which direction will oxygen move via simple diffusion?
out of the cell, against its concentration gradient
into the cell, down its concentration gradient
out of the cell, down its concentration gradient
into the cell, against its concentration gradient

Explanation:

Simple diffusion moves substances from high - to low - concentration areas. Since oxygen concentration is higher in interstitial fluid than in cytosol, oxygen will move into the cell down its concentration gradient.

Answer:

Into the cell, down its concentration gradient