Answer: 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.
The diffusion of the salts from descending on the limb of the loop of the Henle. Thus option D is correct.
The diffusion is a net movement of the matter from the region of high concentration to those of lower concentration. It is driven by the Gibbs in free energy of the chemical potential.
The renal medulla is the innermost part of the kidneys that helps in the maintenances of salts and water in the blood. A high osmolarity takes place when there is many solutes example Na+.
Find out more information bout the osmolarity.
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