Question

Absorption of major part of $N{a}^{+}$ and $K^{+}$ ions occurs in

• A. Proximal convoluted tubule
• B. Bowmans capsule
• C. Distal convoluted tubule
• D. Loop of Henle

Answer 1

The correct option is A Proximal convoluted tubule

A large amount of reabsorption occurs in the proximal convoluted tubule(PCT). Reabsorption is when water and solutes in the PCT are removed and moved back into the blood. In the PCT this process occurs via bulk transport. The solutes and water move from the PCT to the interstitium and then into peri-tubular capillaries. The re-absorption in the proximal tubule is iso-smotic. In the PCT 65% of water, 100% of glucose, 100% amino acids, 65% of potassium, 65% chloride and 67% of sodium isreabsorbed.This re-absorption occurs due to the presence of channels on the basolateral (facing the interstitium) and apical (facing the lumen).

So, the correct option is 'Proximal convoluted tubule'.