The biochemical changes in the body after death that produce a stiffening of the muscles is known as:

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Rigor mortis is the process in which muscles become stiff and difficult to move after a person has died. It is caused by the biochemical changes that occur in the body after death, which cause the muscles to contract and become locked in place. Algor mortis refers to the cooling of the body after death, autolysis is the process in which cells begin to break down after death, and postmortem lividity refers to the settling of blood in the lower parts of the body after death.

The Biochemical Changes in the Body After Death That Produce