Question

The maximum amount of electrolytes and water (70-80 percent) from the glomerular filtrate is reabsorbed in which part of the nephron ?

• A. Ascending limb of the loop of Henle
• B. Distal convoluted tubule
• C. Proximal convoluted tubule
• D. Descending limb of the loop of Henle

Answer 1

The correct option is C Proximal convoluted tubule

Proximal convoluted tubule helps in the reabsorption of most electrolytes and water from the glomerular filtrate, independent of hormones. They are reabsorbed mostly by Na${}^{+}$ K${}^{+}$ transport and water is reabsorbed due to the presence of many aquaporins.

The loop of Henle is responsible for reabsorption of Na${}^{+}$ and Cl${}^{-}$. Only 15% water is reabsorbed from the loop of Henley.

Distal convoluted tubule regulates water and electrolyte absorption only in presence of the hormones aldosterone and vasopressin. So, only fewer amounts of electrolyte and water are reabsorbed.

So the correct option is C.