GENERAL ANATOMY
MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Lack of calcium ions attach to tropomyosin
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Lack of ATP attach to the myosin head
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Muscle stiff due to lack of heat
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Lactic acid accumulates in muscle
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Detailed explanation-1: -The main cause of rigor mortis is depletion of the cell’s energy molecule, ATP. ATP separates actin-myosin bridges during muscle relaxation. Without ATP, cross-bridging locks muscles in place. Eventually, decomposition breaks the bridges and muscles relax.
Detailed explanation-2: -After death, the muscle cells lack ATP. In that case, the myosin gets adhered to the actins, and the muscle cells cannot relax without ATP. Thus, the muscle becomes rigid. Hence, Rigor mortis occurs after death in the absence of ATP.
Detailed explanation-3: -Adenosine triphosphate (ATP) is a necessary component in the relaxation of the myosin filaments of normal muscle. Rigor mortis commences when the rate of re-synthesis of ATP is less than its degradation. In the early hours after clinical death, muscle glycogen fuels the cycle of hydrolysis and re-synthesis of ATP.
Detailed explanation-4: -Subsequent to a person’s death, metabolism becomes anaerobic with the depletion of ATP. Since ATP is needed to bind to myosin and release it from the actin filament, the myosin remains bound in the contracted state.