the problems associated with a definition of death and the significance of the heart and the brain together

•death has multiple definitions 

          •death used to be defined as when the heart stopped beating 

          •now, if someone is brain dead and isn't breathing is considered dead

                    •however, people who are braindead can be kept alive on a life-support machine even if there is no ‘life’ as we know it, and they don't appear to be dead

                              •however, a life-support machine can be legally turned off and death declared