If it is preserved adequately, they usually remain usable (i.e usable for transplant) for 8 hours once they have been removed from the body. However the time varies depending on what kind of transplant it is; hearts have a shorter usable time outside the body, corneas can be out for a couple of weeks.
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A person can't live without a heart (the organ), but a person does not need empathy or love to live.
no
a human can live without n organ for example i may lose a kindy or galnd n i am still living
A human can live without liver though the liver is removed again it grows.
A kidney.
Certain organs you can live without. It will be rough, but you can do it.
no
kidney
Sadly while their body can continue to go on with the help of machines, their mind, their personality, and all other parts of them mentally are already gone. Once a doctor has pronounced a person brain dead he is sure of his findings and this is something that cannot be reversed. There is no blood flow in their brain and their brain does not react in any way to stimulation. A quick way to see if someone may be brain dead is shining light into their eyes; a person who is truly brain dead does not have a pupil response. Eventually this person who is brain dead is let off of machines which keep their body alive and their body dies as well. Hopefully, if the person is able to give organ donations they do so, because they could be saving other's lives.
The first persn to live on the planet is dead
No. You are dead. In some cases life does exist but the brain is dead and the person is on a machine.