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(A) Blood coagulation (clotting) is a process that involves the conversion of fibrinogen into fibrin threads,which requires clotting factors. $1$. Blo

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Blood serum

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(A) Blood coagulation (clotting) is a process that involves the conversion of fibrinogen into fibrin threads,which requires clotting factors. $1$. Blood serum is the fluid remaining after blood has clotted,meaning it lacks fibrinogen and other clotting factors,so it cannot coagulate. $2$. Lymph (from the thoracic duct) contains clotting factors and can coagulate,though more slowly than blood. $3$. Whole blood from the pulmonary vein contains all cellular components and clotting factors,so it will coagulate. $4$. Blood plasma contains fibrinogen and other clotting factors,so it will coagulate if exposed to the necessary triggers.

Column $I$	Column $II$ $\&$ $III$
$I$. Erythrocytes	$D$. Enucleated,biconcave circular in shape; $N$. Transport of gases $O_2$ and $CO_2$.
$II$. Neutrophils	$A$. Spherical large cells,nucleus with many lobes; $O$. Phagocytic in function.
$III$. Lymphocytes	$C$. Spherical nucleus,agranular cytoplasm; $M$. Humoral and cell-mediated immunity.
$IV$. Thrombocytes	$B$. Cellular fragments small,oval shaped; $L$. Clotting of blood.

$A$ drop of each of the following is placed on four separate slides. Which one will not coagulate?

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