Rigor mortis occurs because of damage done to the sarcolemma after death.

Name: Rigor mortis occurs because of damage done to the sarcolemma after death.
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Rigor mortis occurs as a result of chemical changes that occur in the muscles after death, not due to damage to the sarcolemma. Specifically, the lack of ATP after death leads to the inability of myosin to release from actin in the muscles, causing them to become stuck in a contracted state, leading to stiffness.

Rigor Mortis Occurs Because of Damage Done to the Sarcolemma