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Ca 2+ in sarcoplasmic reticulum is released, exposing actin active sites, which the myosin head to bind to them. This results in the power stroke that contracts muscles. However, the Ca 2+ is still around, keeping the active sites exposed, which means myosin stays locked in. This muscle contraction is what is known as rigor mortis

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Q: What causes muscles to remain in a contracted state called rigor moritis for a brief period of time after the organism dies?
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