1. Organ transplantation: Organ transplantation is a surgical process by which an organ is extracted from a particular body and inserted in the recipient’s body to repair an organ that is damaged or absent.
2. Replacing dead cells: When cells are damaged or they die, the body produces new cells. It's called cell division.
3. Production of blood cells: Haematopoiesis is the method of the formation of blood cells. The bone marrow consists of blood cells. That would be a spongy tissue between other bones. This requires youthful cells known as stem cells.