The hormone that stimulates heart beat is
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Parasympathetic stimulation reduces the rate at which impulses are produced, decreasing the rate and force of the heart beat. The sympathetic nerves supply the SA and AV nodes and the myocardium of atria and ventricles. Sympathetic stimulation increases the rate and force of the heart beat.
The hormones adrenaline and noradrenaline, secreted by the adrenal medulla, have the same effect as sympathetic stimulation, i.e., they increase the heart rate.
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