The absorptive epithelia in the gut are considered "polarized" because
A) thick and thin filaments are present.
B) they pump wastes into the lumen while pumping nutrients toward the blood.
C) the colors seen on the top and bottom of the cells are different.
D) they must fire action potentials to absorb most nutrients.
E) the structures on the apical surface are different than those on the basal surface.

Question

Quizplus · Accepted Answer

The term "polarized" refers to the fact that the structures on the apical (top) surface of the epithelial cells are different than those on the basal (bottom) surface. This allows for the selective absorption of nutrients from the gut lumen across the epithelial layer and their transport into the bloodstream through the basal surface.

The Absorptive Epithelia in the Gut Are Considered "Polarized" Because