In liver ammonia is formed from which amino acid ?
**Core Concept**
The liver plays a crucial role in amino acid metabolism, including the breakdown of certain amino acids that lead to the formation of ammonia. This process involves the deamination of amino acids, where the amino group is removed.
**Why the Correct Answer is Right**
The correct answer is related to the amino acid that undergoes deamination in the liver, resulting in the production of ammonia. This process is critical for the liver's role in nitrogen metabolism and involves enzymes such as glutamate dehydrogenase for the amino acid glutamate.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because, although it is an amino acid, it is not directly associated with ammonia formation in the liver through deamination.
**Option B:** Similarly, this option does not directly lead to ammonia production in the liver.
**Option D:** This option is also incorrect as it is not the primary amino acid involved in ammonia formation through deamination in the liver.
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that ammonia is toxic to the brain, and its levels must be carefully managed, particularly in liver failure. The liver's ability to detoxify ammonia is vital, and impairment of this function can lead to hepatic encephalopathy.
**Correct Answer:** D. Glutamate