Mammalian kidney, under restricted water supply can conserve water by over ________ % reabsorption of glomerular filtrate
Correct answer: D. 99.50%
- A. 80.50%
- B. 90.50%
- C. 95.50%
- D. 99.50%
Explanation
The kidneys normally reabsorb about 99% of glomerular filtrate, and under restricted water supply reabsorption can exceed 99.5%, leaving only a small volume as urine. The lower values describe ordinary or incomplete reabsorption and do not represent maximum water conservation; 99.5% is the intended textbook value.
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The kidney and urinary system remove nitrogenous wastes, regulate water and ion balance, and help maintain blood pH through filtration, selective reabsorption and secretion. Questions cover nephron structure, ultrafiltration, the loop of Henle, collecting ducts, urine formation and the roles of ADH and aldosterone, while distinguishing excretion from egestion.
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