During muscle contraction,myosin crossbridges bind to active sites on:

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During muscle contraction, myosin crossbridges bind to the active sites on actin, causing the thin filaments to slide relative to thick filaments and resulting in muscle contraction. T-tubules are specialized invaginations of the sarcolemma that transmit action potentials deep into the muscle fiber. Tropomyosin and troponin are regulatory proteins that block the active sites on actin when muscle is at rest, preventing myosin crossbridge binding.

During Muscle Contraction,myosin Crossbridges Bind to Active Sites On