An adaptation of the epithelial cells of the proximal convoluted tubule for reabsorption is
A)thin walls.
B)rugae folds that increase surface area.
C)secreting enzymes that activate absorption of substances.
D)microscopic projections called microvilli.

Question

Quizplus · Accepted Answer

The microscopic projections called microvilli increase the surface area of the epithelial cells, allowing for greater absorption of substances. Thin walls (A) and rugae folds (B) do not specifically aid in reabsorption, and there is no evidence of the cells secreting enzymes that activate absorption of substances (C).

An Adaptation of the Epithelial Cells of the Proximal Convoluted