<prompt> Heparin is a:Glycosamino glycanPolysaccharideProteoglycanCarbohydrate  <response>: Ans. A. Glycosamino GlycanRef: Harper 31e page 605Heparin is a Glycosamino Glycan.Glycosamino Glycans are heteropolysacchrides.Disaccharide repeat unit is Glucosamine and Iduronic acid.Initially uronic acid present is Glucuronic acid, 5 epimerase convert 90 of GlcUA to IdUA.Heparin is found in the granules of mast cells, also in lung, liver and skin. Heparin specifically bind to lipoprotein lipase present in capillary walls and cause its release into circulation.Heparin is an anticoagulant. 