Illustration depicting the primary endocrine organs of a female System Significant diseases,, Significant tests, Specialist Glossary Endocrinology (from + ) is a branch of and dealing with the, its diseases, and its specific secretions known as. It is also concerned with the integration of developmental events proliferation, growth, and differentiation, and the psychological or behavioral activities of,, function,,,,,,,,,, and caused.

Feb 27, 2019.

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Specializations include behavioral endocrinology. The endocrine system consists of several, all in different parts of the body, that secrete hormones directly into the blood rather than into a duct system. Hormones have many different functions and modes of action; one hormone may have several effects on different target organs, and, conversely, one target organ may be affected by more than one hormone.

Main article: Endocrinology is the study of the endocrine system in the human body. This is a system of which secrete hormones.

Hormones are chemicals which affect the actions of different organ systems in the body. Examples include,,. The endocrine system involves a number of feedback mechanisms, so that often one hormone (such as ) will control the action or release of another secondary hormone (such as ).

If there is too much of the secondary hormone, it may provide negative feedback to the primary hormone, maintaining. In the original 1902 definition by Bayliss and Starling (see below), they specified that, to be classified as a hormone, a chemical must be produced by an organ, be released (in small amounts) into the blood, and be transported by the blood to a distant organ to exert its specific function. This definition holds for most 'classical' hormones, but there are also mechanisms (chemical communication between cells within a tissue or organ), signals (a chemical that acts on the same cell), and signals (a chemical that acts within the same cell). A signal is a 'classical' hormone that is released into the blood by a neurosecretory neuron (see article on ). Hormones [ ].

Examples of steroid hormones Griffin and Ojeda identify three different classes of hormones based on their chemical composition: Amines [ ] Amines, such as,, and (), are derived from single, in this case tyrosine. Hormones such as 3,5,3’-triiodothyronine (T3) and 3,5,3’,5’-tetraiodothyronine (thyroxine, T4) make up a subset of this class because they derive from the combination of two iodinated tyrosine amino acid residues. Peptide and protein [ ] and protein hormones consist of three (in the case of ) to more than 200 (in the case of ) amino acid residues and can have a molecular mass as large as 30,000 grams per mole. All hormones secreted by the pituitary gland are peptide hormones, as are from adipocytes, from the stomach, and from the.

Steroid [ ] are converted from their parent compound,. Steroid hormones can be grouped into five groups by the receptors to which they bind:,,,,. Some forms of, such as, are steroid-like and bind to homologous receptors, but lack the characteristic fused ring structure of true steroids. As a profession [ ] Endocrinologist Occupation Names Doctor, Medical specialist. Fields of employment, Although every organ system secretes and responds to hormones (including the,,,,, and the ), the clinical specialty of endocrinology focuses primarily on the endocrine organs, meaning the organs whose primary function is hormone secretion. These organs include the,,,,,. An endocrinologist is a who specializes in treating disorders of the endocrine system, such as,, and many others (see ).

Work [ ] The medical specialty of endocrinology involves the diagnostic evaluation of a wide variety of symptoms and variations and the long-term management of disorders of deficiency or excess of one or more hormones. The diagnosis and treatment of endocrine diseases are guided by tests to a greater extent than for most specialties. Many diseases are investigated through excitation/stimulation or inhibition/suppression testing.