How does urine gets yellow colour, whereas the water we drink is actually colourless?
In: Biology
Your red blood cells use something called a heme group to hold oxygen and deliver it to your tissues. When these cells die, heme is metabolized or processed to form many byproducts such as bilirubin that goes into the bile and then the intestine where it is converted to urobilinogen and then stercobilin which gives poop its brown color. Urobilinogen partially goes back in the blood, reaches the kidney and gets excreted or disposed of. When it’s exposed to air, it’s oxidized or converted by oxygen to urobilin which is a yellow pigment.
TL;DR: we drink colorless water but urine is colored because we dump waste in it.
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