Why does our body reject other people’s donated organs and require immunosuppressants to be taken but getting someone else’s blood is ok?

Question

Why does our body reject other people’s donated organs and require immunosuppressants to be taken but getting someone else’s blood is ok?

In: 157

Answer 1

First of all: getting someone else’s blood is not “okay”, they need to find a donor that matches your blood type otherwise your body would “reject” the blood (and that could kill you).
Secondly, donated blood stays in your system for two weeks maximum. A donated organ stays in your body much longer, hence there’s more opportunity for your immune system to attack the donated organ.