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 apical surface is different from the basal surface

Question

Quizplus · Accepted Answer

The term "polarized" refers to a physical and functional difference between the apical and basal surfaces of the epithelial cells. The apical surface faces the lumen and is specialized for nutrient absorption, while the basal surface faces the underlying tissues and is involved in cell-cell communication and attachment. This polarity is important for the proper function of the gut epithelium.

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