C is correct,,,,,
45% is about right !
The body reabsorbs urea in the inner medullary collecting duct to maintain a high concentration of solutes in the renal medulla, which is crucial for water conservation and urine concentration.
Urea is formed in the body through the urea cycle, a series of biochemical reactions primarily occurring in the liver. This process converts toxic ammonia, a waste product of protein breakdown, into urea, a much less toxic compound that can be excreted in urine.
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