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3. The hormone adrenaline has multiple functions throughout the body. One effect it has is to increase heart rate. Adrenaline

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Inside the cardiac muscle calcium helps in the interaction between thin and thick filaments ( actin and myosin) . Calcium binds with the protein troponin present in the actin filament , causes a position change in another protein tropomyosin and exposed the actin sites and myosin will attach to for contraction . Thus an increase in calcium in the heart muscle causes increase activity.

Myoma head Troponin Tropomyosin Achin Blocked binding sites for myonin Ca 2t Myanin binding Porition change of tropomyoran si

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