Which cycle is shown in this diagram?
Correct answer: D. Both (A) and (B)
- A. Ornithine cycle
- B. Urea cycle
- C. Urine cycle
- D. Both (A) and (B)
Explanation
The cycle depicted in the diagram is the Urea Cycle. Also known as the ornithine cycle or the Krebs-Henseleit cycle, it is a series of biochemical reactions in which ammonia (NH3) is converted into urea. Urea is less toxic than ammonia and can be safely excreted by the body in urine.
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About Homeostasis
Homeostasis maintains a stable internal environment through the kidney and urinary system, thermoregulation and excretion. The kidney topics include filtration, selective reabsorption, urine formation and water balance, while thermoregulation involves sweating, vasodilation, vasoconstriction and hormonal control; excretion is different from egestion, which removes undigested food.
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