Which of the following blood corpuscles secre | vedclass

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(A) Serotonin is a chemical messenger that acts as a vasoconstrictor.In the human body,serotonin is secreted by:$1$. Basophils: These are granulocytes

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$I$ and $III$ only

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(A) Serotonin is a chemical messenger that acts as a vasoconstrictor.In the human body,serotonin is secreted by:$1$. Basophils: These are granulocytes that release histamine,heparin,and serotonin during inflammatory responses.$2$. Thrombocytes (Blood Platelets): These cell fragments release serotonin to help in the process of blood clotting (hemostasis) by constricting blood vessels at the site of injury.Therefore,both Basophils $(I)$ and Thrombocytes $(III)$ are responsible for the secretion of serotonin.The correct option is $A$.

Column-$I$ (Blood group)	Column-$II$ (Antibody)
$A$. $A$	$P$. $b$
$B$. $B$	$Q$. $a$
$C$. $AB$	$R$. $nil$
$D$. $O$	$S$. $a$ and $b$

Which of the following blood corpuscles secrete serotonin?
$I$. Basophils $\quad$ $II$. Eosinophils
$III$. Thrombocytes $\quad$ $IV$. Lymphocytes
$V$. Monocytes
Select the correct option from the following:

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Match the columns:

Column-$I$ (Blood group) Column-$II$ (Antibody)

$A$. $A$ $P$. $b$

$B$. $B$ $Q$. $a$

$C$. $AB$ $R$. $nil$

$D$. $O$ $S$. $a$ and $b$

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Which of the following components are essential for the process of blood clotting?

What is the percentage of hemoglobin in $RBCs$ (in $\%$)?

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Which of the following blood corpuscles secrete serotonin?$I$. Basophils $\quad$ $II$. Eosinophils$III$. Thrombocytes $\quad$ $IV$. Lymphocytes$V$. MonocytesSelect the correct option from the following: