Which of the following contribute to maintaining the high osmolarity of the renal medulla?
I.active transport of salt from the upper region of the ascending limb
II.the spatial arrangement of juxtamedullary nephrons
III.diffusion of urea from the collecting duct
IV.diffusion of salt from the descending limb of the loop of Henle
A) All of these conditions contribute to the osmolarity of the medulla.
B) I, II, and III
C) I and IV
D) I, II, and IV

Question

Quizplus · Accepted Answer

Active transport of salt from the ascending limb, the arrangement of juxtamedullary nephrons, and diffusion of urea from the collecting duct all contribute to the high osmolarity of the renal medulla. Diffusion of salt does not occur from the descending limb; instead, water is reabsorbed there.

Which of the Following Contribute to Maintaining the High Osmolarity