Tissue donated altruistically can save and/or improve the lives of recipients. Heart valves are life saving tissues for use in patients born with abnormalities in their heart valves, or those who develop abnormalities in their heart valves during their life. Similarly skin used in treatment of burns is life saving. Cornea transplantation and the use of amnion in ophthalmic surgery is sight saving and mobility can be massively improved by the use of bone grafts. These are just some of the types of tissue that can be used in surgery. Read more about the use of tissue here.