Which of the following are primarily responsible for maintaining the salinity gradient of the renal medulla?
A) Cortical nephrons
B) Juxtamedullary nephrons
C) Collecting ducts
D) Proximal convoluted tubules
E) Distal convoluted tubules

Question

Quizplus · Accepted Answer

Juxtamedullary nephrons are located closer to the renal medulla and have longer loops of Henle that extend into the medulla, allowing for the creation and maintenance of the salinity gradient in the renal medulla.

Answer: C 
 Collecting ducts are responsible for transporting urine from the nephrons to the renal pelvis, but they also play a role in maintaining the salinity gradient by reabsorbing water and concentrating the urine.

Which of the Following Are Primarily Responsible for Maintaining the Salinity