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

Question

Quizplus · Accepted Answer

The transport epithelial cells in the ascending loop of Henle have plasma membranes of low permeability to water, which allows them to actively transport ions out of the tubular fluid while retaining water in the tubular fluid. This creates a concentration gradient that is essential for the production of concentrated urine.

In Humans, the Transport Epithelial Cells in the Ascending Loop