Neuroscience and Psychiatry: Open Access

Endocrinology Review Journals

 Endocrinology is that the study of the system within the physical body . This is a system of glands which secrete hormones. Hormones are chemicals which affect the actions of various organ systems within the body. Examples include thyroid hormone, growth hormone, and insulin. The system involves variety of feedback mechanisms, in order that often one hormon will control the action or release of another secondary hormone. If there's an excessive amount of of the secondary hormone, it's going to provide feedback to the first hormone, maintaining homeostasis.In the original 1902 definition by Bayliss and Starling, they specified that, to be classified as a hormone, a chemical must be produced by an organ, be released into the blood, and be transported by the blood to a foreign organ to exert its specific function. This definition holds for many "classical" hormones, but there also are paracrine mechanism,sautocrine signals and intracrine signals A neuroendocrine signal may be a "classical" hormone that's released into the blood by a neurosecretory neuron. Steroid hormones are converted from their parent compound, cholesterol. Mammalian steroid hormones are often grouped into five groups by the receptors to which they bind: glucocorticoids, androgens, estrogens, and progestogens. Some sorts of vitamin D, like calcitriol, are steroid-like and bind to homologous receptors, but lack the characteristic fused ring structure of true steroids.  

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