Rigor Mortis
Several hours after death, all the muscles of the body go into a
state of contracture called “rigor
mortis”; that is, the muscles contract and become rigid, even without action
potentials. This rigidity results from loss of all the ATP, which is required
to cause separation of the cross-bridges from the actin filaments during the
relaxation process. The muscles remain in rigor until the muscle proteins
deteriorate about 15 to 25 hours later, which presumably results from autolysis
caused by enzymes released from lysosomes. All these events occur more rapidly
at higher temperatures.
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