<prompt> Heparin is the commonly used anticoagulant in cardiac surgery. All of the following are true about heparin exceptWeakest acid found in living beingsMost commercial preparations of heparin are derived from pig intestineActs antithrombin activationProduce thrombocytopenia  <response>: Refer KDT 6e p 597 Heparin is the strongest organic acid found in human being It acts by activating AT-3 that inhibits factor CA and 2a Most commercial preparations of heparin are derived from ox lung and pig intestine 