NEET BIOLOGY

Detailed explanation-1: -Reabsorption, active transport, secretion, salt pumping by the loop of Henle and filtration are all selective process in the nephron. Amongst the given options filtration is the least selective process in the nephron.

Detailed explanation-2: -Selective reabsorption The reabsorption is described as a selective process because the reabsorption of filtrate occurs gradually when the filtrate passes down the tubule. Not every component of the glomerular filtrate is reabsorbed into the blood.

Detailed explanation-3: -Example-small ions like sodium and potassium pass freely but, haemoglobin and albumin have practically no permeability. Thus glomerular filtration is non selective as, though all substances must move through the glomerular membrane i.e. plasma and dissolved substances but no blood cells and large blood proteins.

Detailed explanation-4: -The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion.