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endocrinology : ウィキペディア英語版
endocrinology

Endocrinology (from Greek , ''endon'', "within"; , ''krīnō'', "to separate"; and , ''-logia'') is a branch of biology and medicine dealing with the endocrine system, its diseases, and its specific secretions known as hormones. It is also concerned with the integration of developmental events proliferation, growth, and differentiation, and the psychological or behavioral activities of metabolism, growth and development, tissue function, sleep, digestion, respiration, excretion, mood, stress, lactation, movement, reproduction, and sensory perception caused by hormones. Specializations include behavioral endocrinology〔Nelson, R. J. 2005. An Introduction to Behavioral Endocrinology, Fourth Edition. Sinauer Associates, Sunderland, MA.〕〔( Introduction to Behavioral Endocrinology )〕〔( Behavioral Endocrinology )〕 and comparative endocrinology.
The endocrine system consists of several glands, 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.
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 paracrine mechanisms (chemical communication between cells within a tissue or organ), autocrine signals (a chemical that acts on the same cell), and intracrine signals (a chemical that acts within the same cell). A neuroendocrine signal is a "classical" hormone that is released into the blood by a neurosecretory neuron (see article on neuroendocrinology).
==Chemical classes of hormones==

Griffin and Ojeda identify three different classes of hormone based on their chemical composition:

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