As an excretory organ, liver:
Correct answer: D. All of the above
- A. Detoxifies many chemical poisons
- B. Breaks down ammonia for excretion by the kidneys
- C. Produces urea and uric acids from the nitrogen of amino acids
- D. All of the above
Explanation
The liver is an organ that comes into play after consumption of alcohol, as you can remember excess alcohol consumption can result in liver cirrhosis, where scarring occurs on the liver after continuous exposure to high amounts of alcohol. The urea cycle (also known as the ornithine cycle) occurs in the mitochondria of liver cells and results in the conversion of poisonous ammonia (NH3) to urea ((NH2)2CO) which is then excreted in the urine.
This question appeared on the PMC National MDCAT 2020 paper, which you can sit online with every answer explained.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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