It is generally caused by a buildup of lactic acid and is continued by the fact that disrupted ATP production prevents the release of myosin from actin filaments.
When previously released calcium ions are unable to return to the sarcoplasmic reticulum, this process occurs. Interestingly, this process then makes sarcomeres more permeable to calcium ions, often resulting in twitching. It is generally caused by a buildup of lactic acid and is continued by the fact that disrupted ATP production prevents the release of myosin from actin filaments. Approximately 72 hours after it starts, it is resolved by the action of proteolytic enzymes released into the system from lysosomes. FTP, name this postmortem physiological process in which the muscles of an animal body become stiff.
When previously released calcium ions are unable to return to the sarcoplasmic reticulum, this process occurs.
{Rigor Mortis}