eli5 why organs like liver, kidney, heart, lung require rejection meds, but blood transfusions apparently don’t.
In: 20
Your immune system is designed to recognize foreign microbes and fight them. It’s how you keep from getting sick. Organs are pretty complex and can have all sorts of different microbes in them, so there’s a lot that your immune system could potentially get into a fight with.
Blood’s a lot simpler. Humans only have a few different types. Your immune system actually **would** fight the blood if you were given the wrong type – because it would have antigens that your immune system would try to destroy.
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