my book lists bilirubin and urea as the main waste products in blood. i thought bilirubin was pretty much exclusively in bile? (i.e., produced by the liver and then sent to the gut, without much circulation potential)
is bilirubin a main waste product in the blood stream?
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Thread moved. This type of question belongs in the MCAT Study Q&A forum.
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Well, heme is catabolized into bilirubin. Bilirubin in tissues = jaundice. Bilirubin can't get to tissue without first getting into blood. Bilirubin, if I'm not mistaken, is also responsible for urine being yellow. So, while bilirubin isn't a major component of blood, I think it's safe to say that it is one of the main waste products carried by blood.
