Ezekiel 11:19
"And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them an heart of flesh:"
The heart is the organ of the body that acts as a pump to supply blood with oxygen and nutrients to the other organs of the body. The main reason a person might need a heart transplant is that their heart has stopped pumping blood and the body is no longer able to get the oxygen and nutrients it needs. Though there are many contributing factors as to why a person may or may not qualify for a heart transplant, the main need is a donor to give their heart. That means someone must die so that another can continue to live.