Pretty much what it says in the title. How do organ transplants know to heal with donor tissue. Also when the body rejects a donor, is that due to genetic differences?
In: Biology
The basic concept is that scar tissue is basically blood cells and collagen which forms new structures to repair tissues. if the organ connects and operates correctly the body will assimilate it.
The issue is that all cells have a genetic code to them which is recognized by immune/white blood cells.
If the white blood cells dont recoginize the code of the object they consider it a foreign object or an infection and try to remove it, kill it or in cases of solid objects like glass or bullets, build scar tissue around it to isolate it from the body (thats why your tattos turn green and fade a bit with time)
so usually when you seek a match for a organ transplant you look at several genetic markers to make that rejection as weak and low as possible, it will never be zero since its still a foreign object from a different body but you can reduce it using organs with similar genetic markers (and obviously from the same blood type).
The patient will have to take immune system suppressant medication for the rest of his life and will probably be more susceptible to some diseases (so wear your fucking mask) to avoid the body rejecting the organ. This does not mean that he will not have an immune system, but it does mean that his immune system is compromised in some ways that would make him reject the organ.
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