Most people retain adequate kidney function in old age. Why?
A. Decreased activity in old age leads to a decrease in production of toxins.
B. Glomeruli grow new blood vessels through life.
C. Nephrons use blood more efficiently.
D. Older people drink less fluid and therefore have less need to produce urine.
E. A loss of nephrons does not radically impair function because there are so many to begin with.
Answer: E
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