Question

Which one of the following statements with regard to the excretion by the human kidneys is correct?

• A. Descending limb of loop of Henle is impermeable to water
• B. Distal convoluted tubule is incapable of reabsorbing $HC{O}_3$
• C. Nearly 99 percent of the glomerular filtrate is reabsorbed by the renal tubule
• D. Ascending limb of loop of Henle is impermeable to electrolytes

Answer 1

The correct option is C Nearly 99 percent of the glomerular filtrate is reabsorbed by the renal tubule

The Descending limb of loop of Henle is permeable to water but impermeable to electrolytes, whereas the ascending limb of loop of Henle is impermeable to water and permeable to electrolytes.
The DCT plays an important role in maintaining the acid-base balance of the body. Therefore DCT absorbs bicarbonate and secretes protons or absorbs protons and secretes bicarbonate accordingly to maintain the pH of the blood.