In the child of which one of the following couples,Erythroblastosis fetalis is likely to occur?

What is the average lifespan of a human $RBC$ (in $days$)?

Select the correct statement/s regarding blood groups in human.
$i$. Some genetically determined blood group systems are $ABO$, $Rh$, $Duffy$, $Lewis$, $Bombay$ blood group etc.
$ii$. Three types of agglutinogens are present on surface of human $RBCs$ such as $A$, $B$ and $D$.
$iii$. Individuals with blood group "$AB$ $Rh$ $+ve$" have $A$, $B$ and $D$ antigens on the surface of their $RBCs$ and both antibodies 'a' and 'b' in their plasma.
$iv$. Haemolytic disease of Newborn occurs when mother with $Rh$ $-ve$ blood group conceives $Rh$ $-ve$ foetus.
$v$. Individuals with '$AB$' blood group are called universal donors while those with '$O$' blood group are called universal acceptors, with reference to blood transfusion.

Which of the following clotting factors is not synthesized by the liver?

Which organs are responsible for filtering out destroyed red blood cells?

Which of the following formed elements activates the plasma clotting factors?