<Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Organ transplantation is a medical procedure in which an organ is removed from one body and placed in the body of a recipient, to replace a damaged or missing organ . The donor and recipient may be at the same location, or organs may be transported from a donor site to another location . Organs and / or tissues that are transplanted within the same person's body are called autografts . Transplants that are recently performed between two subjects of the same species are called allografts . Allografts can either be from a living or cadaveric source . </P> <P> Organs that have been successfully transplanted include the heart, kidneys, liver, lungs, pancreas, intestine, and thymus . Tissues include bones, tendons (both referred to as musculoskeletal grafts), corneae, skin, heart valves, nerves and veins . Worldwide, the kidneys are the most commonly transplanted organs, followed by the liver and then the heart . Corneae and musculoskeletal grafts are the most commonly transplanted tissues; these outnumber organ transplants by more than tenfold . </P> <P> Organ donors may be living, brain dead, or dead via circulatory death . Tissue may be recovered from donors who die of circulatory death, as well as of brain death--up to 24 hours past the cessation of heartbeat . Unlike organs, most tissues (with the exception of corneas) can be preserved and stored for up to five years, meaning they can be "banked". Transplantation raises a number of bioethical issues, including the definition of death, when and how consent should be given for an organ to be transplanted, and payment for organs for transplantation . Other ethical issues include transplantation tourism and more broadly the socio - economic context in which organ procurement or transplantation may occur . A particular problem is organ trafficking . </P>

Of the organs that are suitable for transplant which is the most commonly transplanted