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The yellow color in urine is due to chemicals called urobilins. When red blood cells get broken down, the stuff that makes them red ( known as haem, or heme if you're in the USA) is broken down into yellow bilirubin. The liver then converts the bilirubin into a soluble form that can be excreted, and some of this ends up in the urine, after further chemical reactions which turn it into substances called urobilins (which are also yellow).

It's due to excretion of urochrome, a blood pigment. Urochrome is a yellow-colored pigment that gives the color to urine.

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15y ago

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