Читать книгу Essential Endocrinology and Diabetes - Richard I. G. Holt - Страница 32

 Endocrinology is the study of hormones, defined classically by their secretion into the bloodstream

 The endocrine and nervous systems are the body's two major communication systems

 A hormone is a chemical messenger that elicits specific effects by binding to a receptor on or inside target cells

 The three major types of hormones are peptides and the derivatives of amino acids or cholesterol

 Negative and, occasionally, positive feedback, and cyclical mechanisms operate to regulate hormone production, commonly as part of complex multiorgan systems or axes

 Clinical endocrine disorders usually reflect too much, too little or dysregulated hormone production