$Thrombocytes$ are cell fragments rather than true cells.

Assertion: $WBCs$ accumulate at the site of wounds by diapedesis.
Reason: It is the squeezing of leucocytes from the endothelium.

Which blood group$(s)$ can be safely transfused to a person with blood group $A$?

Analogy type questions:
$(1)$ Human $RBCs$ : Enucleated : : $WBCs$ : ......
$(2)$ $'O'$ blood group : Universal donor : : $'AB'$ blood group : ......

In which one of the following human organs are the old and worn-out RBCs destroyed?

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