crossbridge

noun
cross·​bridge | \ˈkrȯs-ˌbrij \

Medical Definition of crossbridge 

: the globular head of a myosin molecule that projects from a myosin filament in muscle and in the sliding filament hypothesis of muscle contraction is held to attach temporarily to an adjacent actin filament and draw it into the A band of a sarcomere between the myosin filaments

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