During the process of blood clotting,fibrin i | vedclass

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(A) The process of blood clotting involves a cascade of enzymatic reactions. $1$. When an injury occurs,platelets release factors that activate the en

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Thrombokinase

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(A) The process of blood clotting involves a cascade of enzymatic reactions. $1$. When an injury occurs,platelets release factors that activate the enzyme thrombokinase. $2$. Thrombokinase converts inactive prothrombin into active thrombin. $3$. Thrombin then acts on the soluble plasma protein fibrinogen to convert it into insoluble fibrin threads. $4$. These fibrin threads form a meshwork that traps blood cells to form a clot. Therefore,the conversion of fibrinogen to fibrin is mediated by thrombin,which is activated by thrombokinase.

Column-$I$	Column-$II$
$A$. Polycythemia	$I$. Decrease in number of WBCs
$B$. Erythrocytopenia	$II$. Increase in number of RBCs
$C$. Leukemia	$III$. Decrease in number of RBCs
$D$. Leucopenia	$IV$. Uncontrolled increase in number of WBCs

During the process of blood clotting,fibrin is formed by:

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