In humans, the transport epithelial cells in the ascending loop of Henle
A) have 50% of their cell mass made of smooth endoplasmic reticulum.
B) are not in contact with interstitial fluid.
C) are the largest epithelial cells in the body.
D) have plasma membranes of low permeability to water.
E) are not affected by high levels of nitrogenous wastes.
Answer: D