Ah, beta, in medical books they say it is the sliding filament theory – actin and myosin making bridges, sarcomeres shortening. And after death, ATP runs out, so the bridges cannot break, causing rigor mortis. But I have stitched enough dhotis and heavy lehengas to know that real stiffness is not just in textbooks. When my old Usha machine finally seized after thirty-five years of service, its frozen pedal taught me more about permanent contraction than any diagram.
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