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  Rigor Mortis

Rigor Mortis:

Few hours after death all the muscles of the body achieve a state of contracture termed as Rigor mortis. This is due to whole depletion of ATP in muscle fibres. The muscle stays in rigor, until the lysosome enzymes wholly destroy all the muscle proteins. This will occur inside 15 to 25 hours after death.

Based on temperature and other circumstances, rigor mortis lasts around 72 hours. The phenomenon is caused by the skeletal muscles partly contracting. The muscles are not capable to relax; therefore the joints turn out to be fixed in place.

More particularly, what happens is that the membranes of muscle cells turn out to be more permeable to calcium ions. Living muscle cells spend energy to transport calcium ions to the exterior of the cells. The calcium ions which flow into the muscle cells support the cross-bridge attachment among actin and myosin, two kinds of fibers which work altogether in muscle contraction. The muscle fibers ratchet shorter and shorter till they are fully contracted or as long as the neuro-transmitter acetylcholine and the energy molecule adenosine triphosphate (i.e., ATP) are present. Though, muscles require ATP in order to discharge from a contracted state (it is employed to pump the calcium out of the cells and hence fibers can unlatch from each other). ATP reserves are rapidly exhausted from muscle contraction and other cellular procedures. This means that the actin and myosin fibers will stay linked till the muscles themselves begin to decompose.

 

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