alleryStart learning →What proportion of the water filtered by the kidneys is recovered?
AAbout 50 percent
BAbout 75 percent
CAbout 90 percent
DAbout 99 percent
Answer & Solution
Correct answer: D. About 99 percent
1. The kidneys filter the entire blood volume about 300 times a day.
2. That produces an enormous filtrate volume that the body cannot afford to lose.
3. Ninety-nine percent of the filtered water is recovered and returned to the circulation.
4. The remaining one percent leaves as the one to two litres of urine produced daily.
_Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 25 "The Urinary System", section 25.5 Physiology of Urine Formation_
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