Question

Which part of nephron allows the selective reabsorption of useful substances like glucose, amino acids, salts and water into the blood capillaries?

Answer 1

Answer:

Reabsorption takes place mainly in the proximal convoluted tubule of the nephron . Nearly all of the water, glucose, potassium, and amino acids lost during glomerular filtration reenter the blood from the renal tubules.

Answer 2

Answer:

The proximal convoluted tubule of the nephron absorbs the substances like glucose, amino acids, salts, water into the blood capillaries.

Explanation:

• In the proximal convoluted tubules, a large amount of reabsorption occurs.
• Water and solutes in the PCT are transported into the bloodstream, this process is called reabsorption.
• This occurs in bulk.
• The solutes and water move to the PCT⇒ interstitium ⇒peritubular capillaries.
• The process of reabsorption in the proximal tubule is isosmotic. ( exhibiting the same osmotic pressure)
• The PCT absorbs

1. 65% of water, potassium and chloride,
2. 100% of  glucose
3. 100% of amino acids
4. 85-90% of bicarbonate

• Reabsorption takes place through two routes:

1. paracellular route - transports solutes within the cells, through intercellular spaces.
2. transcellular route - transports through a cell.

• The driving force of reabsorption in the PCT is sodium.

Hence, Proximal convoluted tubules are the part of the nephron that allows the reabsorption of useful substances like amino acids, salts, water, glucose, into the blood capillaries.