Medical Definition of angiosperm. : any of a class (Angiospermae) of vascular plants (as orchids or roses) that have the seeds in a closed ovary and include the monocotyledons and dicotyledonsâcompare gymnosperm.
Bilirubin (formerly referred to as haematoidin) is the yellow breakdown product of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin. Bilirubin is excreted in bile and urine, and elevated levels may indicate certain diseases.
Bilirubin is the main bile pigment that is formed from the breakdown of heme in red blood cells. The broken down heme travels to the liver, where it is secreted into the bile by the liver.Normally, a small amount of bilirubin circulates in the blood.Serum bilirubin is considered a true test of liver function, as it reflects the liver's ability to take up, process, and secrete bilirubin into the bile.he free, or unconjugated, bilirubin is carried by albumin to the liver, where it is converted or conjugated and made water soluble. Once it is conjugated into a water-soluble form, bilirubin can be excreted in the urine. An enzyme, glucuronyl transferase, is necessary for the conjugation of bilirubin.