Q. Which one of the following statements in regard to the excretion by the human kidneys is correct?
A) Ascending limb of Loop of Henle is impermeable to electrolytes
B) Descending limb of Loop of Henle is impermeable to water
C) Distal convoluted tubule is incapable of reabsorbing HCO₃⁻
D) Nearly 99 percent of the glomerular filtrate is reabsorbed by the renal tubules
Explanation
[Solution from source] About 180 L of filtrate is formed each day but only about 1.5 L of urine is passed, so nearly 99% is reabsorbed. The ascending limb is impermeable to water (not electrolytes), the descending limb is permeable to water, and the DCT does reabsorb HCO₃⁻. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.