Beta-alanine is end product of metabolism of
**Core Concept**
Beta-alanine is an amino acid that plays a crucial role in the synthesis of carnosine, a dipeptide found in muscle tissue. The metabolism of certain amino acids leads to the production of beta-alanine, which is then used in the production of carnosine to help regulate muscle pH and improve high-intensity exercise performance.
**Why the Correct Answer is Right**
Beta-alanine is the end product of the metabolism of the amino acid histidine. Histidine is broken down into histamine and then further metabolized into beta-alanine through a series of enzymatic reactions. The enzyme histidase catalyzes the first step in this process, converting histidine into histamine. The histamine is then converted into 4-methylhistidine, which is further metabolized into beta-alanine. The beta-alanine is then used to synthesize carnosine in muscle tissue.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not accurately describe the end product of beta-alanine metabolism.
* **Option B:** This option is incorrect because it does not accurately describe the end product of beta-alanine metabolism.
* **Option C:** This option is incorrect because it does not accurately describe the end product of beta-alanine metabolism.
**Clinical Pearl / High-Yield Fact**
Beta-alanine supplementation has been shown to increase muscle carnosine levels, which can improve high-intensity exercise performance by delaying the onset of fatigue and reducing the accumulation of metabolic byproducts.
**Correct Answer:** D.