Question

Which portion of the nephrons reabsorb substances?

Answer 1

The correct answer of this question is PCT(Proximal Convoluted Tubule).

Step-by-step explanation:

PCT in the nephron is adapted to absorb most of the substances from the filtrate.They contain large amount of mitochondria which generate energy for reabsorption of glucose, ions like sodium and potassium,amino acids by active transport.

PCT contains microvilli which increase the surface area for absorption and absorbs all the glucose and amino acids from filtrate. Other substances which PCT reabsorbs are hormones, vitamins, water, urea, bicarbonate ions and chloride ions.

Answer 2

Proximal convoluted tubule, Loop of Henle, Distal convoluted tubule

Step-by-step explanation:

Nephron is the functional and structural unit of kidney. They begin in kidney cortex, go to medulla and return to cortex before finally opening to collecting duct. Proximal convoluted tubule(PCT), Loop of Henle and Distal convoluted tubule(DCT) form parts of nephron. Along with collecting duct they are involved in reabsorption of various substances.

Reabsorption of many substance occur based on their concentration gradients. Water reabsorption is regualted by ADH, aldosterone and renin. From PCT reabsorption of glucose, water, amino acid, vitamin, urea, sodium etc takes place. Form loop of Henle reabsorption of sodium, water, bicarbonate ions etc takes place. From DCT reabsorption of sodium, water, hydrogen ions, ammonium ions etc takes place.