Question

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

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

Answer 1

Answer: (B)

Nearly 99% of glomerular filtrate is reabsorbed by renal tubules

About 180 litres (100%) of fluid is filtered out of blood every day by nephrons but an adult human excretes, on an average, 1 to 1.5 litres (1 %) of urine per day. The remaining 99% of glomerular filtrate is absorbed into the blood by renal tubules to maintain constant homeostasis in the body. Hence nearly 99% of glomerular filtrate is reabsorbed by renal tubules.

S0, the correct answer is 'Option B'.