Home ยป Ornithine cycle (also known as the urea cycle) refers to the sequence of biochemical reactions taking place in the Excretory System MCQs Ornithine cycle (also known as the urea cycle) refers to the sequence of biochemical reactions taking place in the January 24, 2022 18 Views Q. Ornithine cycle (also known as the urea cycle) refers to the sequence of biochemical reactions taking place in the A. Urinary bladder B. Liver C. Pancreas D. Stomach Answer: Liver