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Myosin
myosin
The head of the myosin filament "walks along" the actin filament forming cross bridges between the two.
Cross-bridge
Troponin controls the position of tropomyosin on the thin filament, enabling myosin heads to bind to the active sites on actin.
Cross bridge
myosin binding to actin
myosin
What cross-bridge cycling requires is ATP, actin, inorganic phosphate, myosin, and ADP.
Cross bridge
ATP binds to the myosin head
ATP binding to the myosin head