The high osmolarity of the renal medulla is maintained by all of the following except

the correct option is C (diffusion of salt from the descending limb of the loop of Henle).

Explanation:

Renal medulla is the inner part of the kidney that aids in the maintenance of salt and water in the blood. High osmolarity occurs when there is much solutes example Na+, in the serum glomerular filtrates. This can be maintained by :

-the spatial arrangement of juxtamedullary nephrons.

- diffusion of salt from the thin segment of the ascending limb of the loop of Henle.

- active transport of salt from the upper region of the ascending limb.

- diffusion of urea from the collecting duct.

Note: descending limb of the loop of Henle is not permeable to salts but water.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.