Blood_coagulation(Blood clotting Chapter).pdf

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BY DEEPAK VERMA

COAGULATION OFBLOOD
Coagulationorclottingisdefinedastheprocessinwhich
bloodlossesitsfluidandbecomesa jellylikemassfew
minutesafteritisshedoutofcollectedinacontainer.

COAGULATION OFBLOOD
Duringthisprocess, thefibrinogenisconvertedintofibrin.
Fibrinthreadsgetattached totheloose plateletplug,
whichplugstherupturedpartofbloodvesselsand
preventsfurtherbloodlosscompletely.

FACTORSINVOLVEDINBLOODCLOTTING
CLOTTINGFACTORS
Coagulationofbloodoccursthroughaseriesofreactions
due to the activation of a group of substances necessary
forclotting arecalledclottingfactors.

FACTORSINVOLVEDINBLOODCLOTTING
Thirteenclottingfactorsareidentified.
1.Factor–1:Fibrinogen
2.Factor–II:Prothrombin
3.Factor–III:Thromboplastin(TissueFactor)
4.Factor–IV:Calcium
5.Factor–V:LabileFactor
6.Factor–VI:Presencehasnotbeenproved
7.Factor–VII: Stablefactor

FACTORSINVOLVEDINBLOODCLOTTING
Thirteenclottingfactorsareidentified.
8.Factor–VIII:Antihemophillicfactor(Antihemophillic
globulin)
9.Factor –IX:Christmas Factor
10.Factor–X:StuartProwerfactor
11.Factor–XI:PlasmaThromboplastinAntecedent
12.Factor–XII:Hageman factor(Contactfactor)
13.Factor–XIII:Fibrin stabilizingFactor(Fibrinase)

STEPS OFBLOODCLOTTING
Ingeneralbloodclottingoccursinthreestages.
1)Formation of Prothrombin activator
2)Conversion of prothrombin into thrombin
3)Conversionof fibrinogenintofibrin

1.FORMATION OFPROTHROMB INACTIVATOR
Bloodclottingcommenceswiththeformationofa substance
Called prothrombin activator,whichconvertsprothrombininto
thrombin.
Itsformationisinitiatedbysubstanceseitherwithintheblood
oroutsidetheblood.
Thus,formationofprothrombinactivator occursthroughtwo
pathways:
1.Intrinsic
Pathway
2.Extrinsic
Pathway

INTRINSICPATHWAYFORTHEFORMATIONOF
PROTHROMBINACTIVATOR

EXTRINSICPATHWAYFORTHEFORMATION
OFPROTHROMBINACTIVATOR

2.CONVERSIONOFPROTHROMBIN INTO
THROMBIN

3.FIBRINOGENINTOFIBRIN

BLOODCLOTTINGDISORDERS
HEMOPHILIA
PURPURA
VONWILLEBRAND DISEASE

ANTICOAGULANTS

TESTSFORBLOODCLOTTING
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