The high osmolarity of the renal medulla is maintained by all of the following except
A) diffusion of salt from the thin segment of the ascending limb of the loop of Henle.
B) active transport of salt from the upper region of the ascending limb.
C) the spatial arrangement of juxtamedullary nephrons.
D) diffusion of urea from the collecting duct.
E) diffusion of salt from the descending limb of the loop of Henle.

Question

Quizplus · Accepted Answer

The high osmolarity of the renal medulla is maintained through a countercurrent multiplier system involving the loop of Henle and collecting ducts. Diffusion of salt from the descending limb of the loop of Henle is not involved in maintaining the high osmolarity of the renal medulla.

The High Osmolarity of the Renal Medulla Is Maintained by All