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Epinephrine or adrenaline is a hormone secreted by adrenal glands in the blood stream. It is one of the two common hormones (the other being glucagon) that is responsible for glycogen breakdown. Secretion of epinephrine is characterized by the presence of extreme emotions such as anxiety or anger thereby resulting in elevated levels of blood pressure along with increased muscle strength and high sugar metabolism. Under strenuous conditions signals are transmitted to brain and brain in turn sends nerve impulses to the adrenal glands in the kidneys and result in the release or secretion of epinephrine.