Job's Body: Rigor mortis occurs when all the ATP (adenosine triphosphate) is used up within the muscles. ATP is what prevents the magnetic lockup between the actin chains and myosin heads (ATP is negative, as is myosin). p. 130
Furthermore, according to NurseMinerva.com: "Even when a person is clinically dead, some cells within their tissues continue to survive for a while. After the circulation of blood ceases, surviving muscle cells resort to anaerobic glycolysis but eventually they become unable to make any more ATP...Calcium ions also leak into the compromised muscle cells, moving regulatory proteins away from the molecular cross-bridges between the myofilaments. The myofilaments then become locked in position as a result of these changes, and the skeletal muscles no longer ‘give’ or stretch when parts of the body are moved.
Rigor mortis wears off as the tissues begin to decompose - proteolytic enzymes in the lysosomes of the muscle cells escape and begin to dissolve the myofilaments."
- Dying & Death section
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