Metabolic Waste of Protein Metabolism

Protein metabolism refers to the breakdown and synthesis of proteins in the body. During the process of protein metabolism, various waste products are produced, which need to be eliminated from the body. The metabolic waste products of protein metabolism include:

1. Urea:
- Urea is the most abundant waste product of protein metabolism.
- It is formed in the liver as a result of the breakdown of amino acids.
- Amino acids are deaminated, which removes the amino group (-NH2) and produces ammonia (NH3).
- The liver converts ammonia into urea, which is then transported to the kidneys for excretion in the urine.

2. Ammonia:
- Ammonia is produced during the deamination of amino acids in the liver.
- It is highly toxic to the body, especially to the central nervous system.
- The liver converts ammonia into urea, which is less toxic and more easily excreted.

3. Creatinine:
- Creatinine is a waste product of muscle metabolism.
- It is produced from creatine, which is found in muscle tissue.
- Creatinine is released into the bloodstream and filtered by the kidneys for excretion in the urine.

Metabolic Waste of Protein Metabolism: Option D
Among the given options, option D (Urea, ammonia, and creatinine) correctly identifies the metabolic waste products of protein metabolism.

- Urea and ammonia are waste products derived from the breakdown of amino acids in the liver. These waste products are excreted by the kidneys through urine.
- Creatinine is a waste product of muscle metabolism. It is released into the bloodstream and excreted by the kidneys through urine.

Conclusion:
The correct answer to the question is option D (Urea, ammonia, and creatinine). These waste products are produced during protein metabolism and need to be eliminated from the body to maintain proper physiological functioning.