The role of the spleen in mammals is . . . . . . .

The average life span of $RBCs$ is . . . . . . days.

In a medicolegal case of accidental interchange between two babies in a hospital,the baby of blood group $A$ could not be rightly given to a couple with:

$A$ person with an unknown blood group under the $ABO$ system has suffered significant blood loss in an accident and requires an immediate blood transfusion. His friend,who has a valid certificate of his own blood type,offers to donate blood without delay. What would be the blood group of the donor friend?

Fibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme........

If a drop of each of the following is placed on four separate slides,which one will not coagulate?