The sliding filament theory explains how our muscles contract when the actin and myosin filaments slide past each other. Calcium exposes the binding sites on actin, and ATP provides the energy for the myosin heads to pull and then detach. But honestly, I keep mixing up the exact sequence of ATP binding and hydrolysis when I'm trying to memorise it from my tattered second-hand guidebook. The theory only makes real sense when I think of my mother's thin arms—the effortful sliding of her *phaneks* as she tries to sit up, that tiny, visible contraction needing all our careful *khujing* and timing, like calcium and ATP working just so.
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