Muscle contraction trigger words and theory

CA 2+ RELEASE from the sarcoplasmic reticulum TROPOMYOSIN Ca2+ attach to Tropomyosin clearing actin binding site ACTIVATE Calciuk ions activate atp hydrolyse to break ATP into adp plus pi releasing energy . This exposes the myosin head. CROSS BRIDGE - myosin attaches to actin forming actinomyosin cross bridge . The previous energy caused myosin head to bend and pull actin over .