Why does our body reject other people’s donated organs and require immunosuppressants to be taken but getting someone else’s blood is ok?
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Blood is pretty simple. It can have one or two markers, or none at all. There is another identification marker it can either have or not have.
If your body does not have blood markers, it is afraid of any marked blood and almost certainly will treat that as a invasion. If you have all the markers then your body is less likely to react to anybody’s blood.
But for meat it’s a whole different story. Your body doesn’t know if you received a replacement kidney from a stranger, or if you have a parasite in your body that already ate one of your kidneys. Your immune system goes around sniffing cells trying to identify if it is “you” or “not you” and as a organ recipient you need to use immunosuppressants to limit your body’s ability to identify a foreign organ, while keeping it strong enough to identify life threatening infections.
Every cell in your body contains your DNA. A strangers organ does not contain your DNA. Your body is able to identify that a large mass of not you is inside of you, and understandably it freaks out.
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