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The myosin heads detach from actin, allowing the muscles to relax; prior to rigor mortis, Directly after death ATP is not produced therefore, Ca +2 is absent within the myosin binding sites on the actin, which leads to the myosin heads not being able to detach from actin, this condition doesnt allow the muscle to relax, aka rigor mortis. For the muscle to relax or for rigor mortis to cease the myosin heads detach from actin.

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14y ago
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Q: What makes rigormortis cease after 72 hours?
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