CHAPTER 58: Bleeding and Thrombosis Flashcards
I
Fibrinogen
II
Prothrombin
IIa
thrombin
III
Tissue thromboplastin
IV
Ionized calcium (Ca2+)
V
Proaccelerin
VII
Proconvertin
VIIa
Convertin
IX
Antihemophilic factor B; plasma thromboplastin component (PTC); Christmas factor
X
Stuart–Prower factor
XI
Plasma thromboplastin antecedent
PTA
XII
Hageman factor
XII
Fibrin-stabilizing factor (FSF)
Va
Accelerin
Prekallikrein
Fletcher factor
promote coagulation, called
procoagulants,
inhibit coagulation
anticoagulants
coagulants normally predominate, so that the blood does not coagulate while it is circulating in the blood vessels.
anticoagulants
formed continually by the liver, and it is continually being used throughout the body for blood clotting
Prothrombin
is required by the liver for normal for- mation of prothrombin as well as for formation of a few other clotting factors
Vitamin K
is a high-molecular-weight protein (MW = 340,000) that occurs in the plasma in quantities of 100 to 700 mg/dl. formed in the liver,
Fibrinogen
is a protein enzyme with weak proteolytic capabilities. It acts on fibrinogen to remove four low-molecular- weight peptides from each molecule of fibrinogen
Thrombin
activates the fibrin-stabilizing factor
Thrombin
operates as an enzyme to cause covalent bonds between more and more of the fibrin monomer molecules, as well as multiple cross- linkages between adjacent fibrin fibers, thus adding tremendously to the three-dimensional strength of the fibrin meshwork.
fibrin-stabilizing factor XIII
composed of a meshwork of fibrin fibers running in all directions and entrapping blood cells, platelets, and plasma
Blood Clot
composed especially of phospholipids from the membranes of the tissue plus a lipoprotein complex that functions mainly as a proteolytic enzyme.
tissue thromboplastin Factor III
activates factor VII to VIIa (intrinsic pathway)
Factor III
activates factor X to Xa
Factor VIIa plus factor IV
Factor Xa plus TF or FACTOR 3 plus Factor V is equals to?
prothrombin activator
catalyses the cleaving of fibrinogen to fibrin?
thrombin
prothrombin to IIa what complex catalyses?
prothrombin activator
prevention of blood loss
HEMOSTASIS
Procoagulant or Anticoagulant
• platelet adhesion and
aggregation
Procoagulant
Procoagulant or Anticoagulant
• fibrin clot formation
Procoagulant
Procoagulant or
• Prostacyclin, NO
Anticoagulant
Procoagulant or Anticoagulant
• natural inhibitors of coagulation and fibrinolysis
Anticoagulant
Procoagulant or Anticoagulant
• ectoADPase/CD39
Anticoagulant
Procoagulant or Anticoagulant
• Heparan proteoglycans
Anticoagulant
• Thrombomodulin
Procoagulant or Anticoagulant
Anticoagulant
• Antithrombin
Procoagulant or Anticoagulant
Anticoagulant
• Major plasma protease inhibitor of thrombin and other clotting factors in coagulation.
Antithrombin(Antithrombin III)
• Neutralizes thrombin and the other activated coagulation factors by forming a complex bet the ACTIVE SITE of the enxyme and the REACTIVE CENTER of antithrombin.
Antithrombin(Antithrombin III)
• Plasma glycoprotein that becomes anticoagulant when it is activated by thrombin that occurs on thrombomodulin
Protein C
o transmembrane proteoglycan-binding site for thrombin on endothelial cell surfaces
• Cleaves and inactivate activated factors V and VIII
• Thrombomodulin
o Cofactor which accelerates action of Protein C
• Protein S
• Megakaryocyte
Platelets
- Megakaryocyte
* Normal Value:
150,000–450,000/L
life span of platelets?
7 to 10days in circulation
o Major regulator of platelet production
o synthesized in the liver
o ↑ synthesis within flammation
• Thrombopoietin (TPO)
- large multimeric protein present in both plasma and extracellular matrix of the subendothelial vessel wall - serves as the PRIMARY MOLECULAR GLUE
o Von Willebrand Factor