The osmolarity in the deepest part of the loop of Henle is ________ mOsM.
A) 1200
B) 100
C) 300
D) 900
E) None of these answers are correct.

Question

Quizplus · Accepted Answer

The loop of Henle is responsible for establishing a concentration gradient in the medulla of the kidney. As the fluid descends through the descending limb of the loop of Henle, water is reabsorbed, which increases the concentration of solutes in the remaining fluid. As the fluid ascends the ascending limb of the loop of Henle, various ions (sodium, potassium, chloride) are reabsorbed, which further increases the concentration of solutes in the fluid. The deepest part of the loop of Henle, the renal medulla, has the highest concentration of solutes, which is estimated to be around 1200 mOsM. Therefore, choice A is the correct answer.

The Osmolarity in the Deepest Part of the Loop of Henle