Once a blood clot forms, it promotes still more clotting through positive_ feedback system.Hemostasis Disorders Abnormal Blood Clots:A clot that forms abnormally in a vessel is a thrombus_.If the above clot dislodges, it is a embolus_.What is a coronary thrombosis?A blood clot that forms in a vessel that supplies the heart.What is hemophilia?Several different bleeding disorders that exhibit similar signs and symptoms.Blood Groups and Transfusions:After mixed success with transfusions, scientists determined that blood was of different types and only certain combinations were compatible.Clumping of red blood cells following transfusion is called _Agglutination__. This clumping is due to the interaction of proteins on the surfaces of red blood cells called _antigens__ with certain proteins called _antibodies_ carried in the plasma.Blood Types:Define antigen and antibody-antigen-substance that is recognized as foreign by the immune system to activate an immuneresponse.antibody-a protein molecule released by a plasma cell that binds to an antigen (an immunoglobin)Identify the antigens and antibodies found in the following blood types.Table 17.4 on page 657 in the textbook will help you with this question.Blood TypeAntigenAntibodyAAAnti-BBBAnti-AABA & BNoneONoneAnti-A & Anti-BRHBlood TypesThe Rh factor was named after the _rhesus__ monkey. If the Rh factor surface protein is present on red blood cells, the blood is Rh _positive_; if not, it is Rh negative_.7