Which adernal hormone accelerates the heart beat under normal conditions?

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Solution

The hormones adrenaline (epinephrine) and nor-adrenaline (nor-epinephrine), secreted by the adrenal medulla, have the same effect as the sympathetic stimulation, i.e. they increase the heart rate. Adrenaline has a greater effect on the heart and metabolic processes whereas nor-adrenaline has more influence on blood vessel diameter.

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