Question

A large quantity of fluid is filtered every day by the nephrons in the kidneys. Only about 1% of it is excreted as urine. The remaining 99% of filtrate

• A. gets collected in the renal pelvis
• B. is lost as sweat
• C. is stored in the urinary bladder
• D. is reabsorbed into the blood

Answer 1

The correct option is D is reabsorbed into the blood

The normal glomerular filtration rate amounts to about 180 liters (about 45 gal) every 24 hours. This is 4.5 times the amount of fluid in the entire body. The renal tubules reabsorb about 99% of the filtrate into the blood, leaving only about 1.5 liters to be excreted as urine during a 24-hour period. Reabsorption permits precise regulation of blood chemistry by the kidneys. Wastes, excess salts, and other materials remain in the filtrate and are excreted in the urine. So, the correct answer is option d.
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