A) kidneys
B) ureters
C) urinary bladder
D) none of the above
Correct Answer: D
Solution :
Ureotelic animals synthesize urea from ammonia in their liver cells. All body cells produce some ammonia as a result of protein metabolism and release it into the blood. This ammonia is taken up from blood by liver cells and turned into urea. However most of the ammonia used in urea synthesis forms in liver cells themselves as a result of deamination of excess amino acids taken from blood.
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