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• Hormones regulate the physiological processes.
• They are produced in very small quantities and are biologically very active.
For example, adrenaline is active even at a concentration of 1 in 300 million
parts.
• Their excess secretion as well as deficiency, both, cause serious disorders.
• Chemically, the hormones may be water-soluble proteins (peptides),
glycoproteins and amines or lipid-soluble steroids.
• The extra hormones are not stored in the body and are excreted out.
