Hormones are chemicals substances produced by glands, are secreted into the bloodstream and move throughout the body influencing human behavior. Thanks to the study of physiological and pathophysiological mechanisms, identified the behavioral effects of the testosterone hormone, cortisol, norepinephrine and serotonin. Recent studies have also demonstrated the importance of vasopressin, dopamine, insulin, thyroid hormone and nitric oxide. These scientific contributions identified the importance of medical research on the causal explanation of aggressive behavior of the human being, within the integral and multidisciplinary approach of contemporary Criminology.

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