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What is urine
made of?
Let's talk more about how the kidneys filter blood. When blood goes through the kidneys, water and some of the other stuff that is in blood (like protein, glucose, and other nutrients) go back into the bloodstream, while the excess stuff and waste is taken out. Urine is what is left behind. But what is it exactly?
Urine contains:
Water
Urea, a waste product that forms when proteins are broken down
Urochrome, a pigmented blood product that gives urine its yellowish color
Salts
Creatinine, a waste product that forms with the normal breakdown of muscle
By products of bile from the liver
Ammonia