The conversion of a protein waste, the ammonia into urea occurs in
A
Kidneys
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B
Lungs
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C
Intestine
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D
Liver
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Solution
The correct option is D Liver The protein is broken down during digestion into amino acids. The amino acids are converted into urea in the liver through urea cycle. Urea cycle is also known as ornithine cycle because ornithine is formed as end product along with the urea.
The extra proteins in the body are degraded by the process of deamination where the NH2 group is removed and it is converted into ammonium ions in the liver. The ammonium ions enter urea cycle and get converted into urea. The urea formed in liver is transported to kidney through circulation and finally gets excreted. So, the correct answer is 'liver'.