A substance, such as histamine or serotonin, that contains amino groups and is pharmacologically characterised by its action on the blood vessels (altering vascular caliber or permeability).
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Hormones are essential in the regulation of the activity of the various biological systems of the human body. The inefficiency of any of these hormonal control systems may lead to the improper functioning of the body. In this tutorial, get to know the different classes of hormones, metabolism, mechanism, and control of hormone secretions. ..