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When doctors note a time of death, it is the moment that the heart beat stops. At this time a person loses awareness and their muscles relax completely. Certain parts of the body, such as brain cells, remain alive for a further three to seven minutes. Shortly after death, the contents of the stomach may be regurgitated and urine and semen emitted.
In The Good Death Guide, Michael Dunn describes the changes in a body in the first day after death. The first significant sign is a sharp drop in body temperature. This is referred to as algor mortis. Other changes include the following: