Transplantation surgery is a surgical system in a human in which a body tissue or organ is exchanged from a giver to a beneficiary or starting with one a part in the body then onto the next. Organs that can be transplanted are the kidneys, liver, heart, lungs, pancreas, digestive tract, and thymus. Sorts of transplantation surgery include: Xenograft and xenotransplantation. Organ givers might live, mind dead, or dead through circulatory demise. Tissue might be recuperated from givers who pass on of circulatory demise, and also of mind passing up to 24 hours past the end of pulse. Not at all like organs, most tissues can be protected and saved up to five years, which means they can be "banked". Transplantation raises various bioethical issues, including the meaning of death, how to and when the transplantation should be done.