Structure of Contractile proteins | Biology

Contractile proteins of muscle are actin and myosin. Actin is the main component of thin filaments and myosin is the main component of thick filaments. The given figure is of the actin filament. There is usually one troponin per 6-8 actin molecules. In this, troponin (b) is attached to the protein tropomyosin (a). It is present within the groove between actin filaments. The main function of tropomyosin is to prevent contraction during the relaxed condition by blocking the attachment site for the myosin cross-bridge.
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