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Why does urea increase in blood when kidneys fail?

Answer and explanation

Correct answer: Kidneys cannot remove urea from blood properly

The governing concept is excretion of nitrogenous waste. During protein metabolism, the liver forms urea from toxic ammonia. Healthy kidneys filter urea from the blood and eliminate it in urine. If kidney function fails, filtration and removal decline, so urea accumulates in the bloodstream, a condition associated with harmful waste buildup. Option A is correct; the lungs, heart, and stomach do not perform this renal excretory role.

Related tags

Kidney-FailureUreaExcretionBloodLife ProcessesWorld Of LivingScienceClass 10 Mcq

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