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Urine
Metabolism of protein has different pathways both anabolic and catabolic. The most common unit known for protein is known as Amino Acid(AA). AAs might end up being part of the muscles, organs in the body, enzymes for other metabolic reactions and during starvation - source of energy.
Often when people consume excess protein, the ammonia formed as a by-product of protein metabolism cannot be eliminated through urine, as it usually is. In this case, it is lost in sweat.
Carbon Dioxide
The Bence-Jones protein is secreted into the urine where it can be measured. It was the first tumor marker identified.
The kidneys secrete urine as a waste product. Urine is a solution composed of water, urea, ammonia, bicarbonate and excess electrolytes.
Urea clearance test. Urea is a waste product that is created by protein metabolism and excreted in the urine. The urea clearance test requires a blood sample to measure the amount of urea in the bloodstream and two urine specimens,
Blood urea nitrogen test (BUN). Urea is a by-product of protein metabolism. This waste product is formed in the liver, then filtered from the blood and excreted in the urine by the kidneys. The BUN test measures the amount of nitrogen.
Uric acid is a by product of protein digestion and can be found in the urine.
Urine from Latin URINA is a typically sterile liquid by product of the body secreted by the kidneys through a process called urination
Urea is a waste product produced by mammals from the breakdown (metabolism) of protein and excreted through urine and in much smaller amounts, perspiration (sweat). This is processed in the body through the liver and passed out of the system as a part of urine by the kidneys.
urine is secreted from the kidney