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- Hormone abstract "A hormone (from Greek ὁρμή, "impetus") is a class of regulatory biochemicals that is produced in all multicellular organisms by glands, and transported by the circulatory system to a distant target organ to coordinate its physiology and behavior. Hormones serve as a major form of communication between different organs and tissues. Hormones regulate a variety of physiological and behavioral activities, including digestion, metabolism, respiration, tissue function, sensory perception, sleep, excretion, lactation, stress, growth and development, movement, reproduction, and mood. Generally, only a small amount of hormone is required to alter cell metabolism.Hormone formation may arise at localized clusters of specific cells known as endocrine glands, or at other specialized cells with several functions. Hormone synthesis occurs in response to specific biochemical signals induced by a wide range of regulatory systems. In some cases, the rate at which these systems act on a hormone depends on the particular effect or properties of the hormone. For instance, ionized calcium concentration modulates PTH synthesis, whereas glucose concentration modulates insulin synthesis. Contrarily, regulation of hormone synthesis of gonadal, adrenal, and thyroid hormones is often dependent on a complex set of direct influences and feedback interactions involving the hypothalamic-pituitary axis (See HPA axis, HPG, HPT).Upon secretion, certain hormones, including protein hormones and catecholamines, are water soluble and are thus readily transported through the circulatory system. On the other hand, some hormones, including steroid and thyroid hormones, are water insoluble; to allow for their widespread distribution, these hormones must bond to carrier plasma glycoproteins (e.g., throxine-binding globulin (TBG)) to form ligand-protein complexes. Some hormones are completely active when released into the bloodstream (as is the case for insulin and growth hormones), while others must be activated in specific cells through a series of activation steps that are commonly highly regulated. The endocrine system secretes hormones directly into the circulatory system typically into fenestrated capillaries, whereas the exocrine system secretes its hormones indirectly using ducts. Hormones with paracrine function diffuse through the interstitial spaces to nearby target tissues.Hormones purposefully affect the target tissue of interest by binding to specific receptor proteins to elicit a specified action in the cellular target. Cells respond to a hormone when they express a specific receptor for that hormone. When a hormone binds to the receptor protein, it results in the activation of a signal transduction mechanism. This ultimately leads to cell type-specific genomic responses that cause the hormone to activate genes that regulate protein synthesis (e.g., up-regulation: synthesis of a receptor for that hormone).Endocrinology is a branch of science concerned with the biosynthesis, storage, chemistry, biochemical and physiological function of hormones and with the cells of the endocrine glands and tissues that secrete them. Plant hormones are known as phytohormones. In animals, the brain is often a target organ for many of these hormones, and the brain, in turn, regulates the secretion of these hormones.".
- Hormone thumbnail Epinephrine_structure.svg?width=300.
- Hormone wikiPageExternalLink hmrbase.
- Hormone wikiPageExternalLink 307.
- Hormone wikiPageExternalLink www.hormone.org.
- Hormone wikiPageID "13311".
- Hormone wikiPageRevisionID "604342240".
- Hormone hasPhotoCollection Hormone.
- Hormone subject Category:Cell_signaling.
- Hormone subject Category:Endocrinology.
- Hormone subject Category:Hormones.
- Hormone subject Category:Physiology.
- Hormone subject Category:Signal_transduction.
- Hormone comment "A hormone (from Greek ὁρμή, "impetus") is a class of regulatory biochemicals that is produced in all multicellular organisms by glands, and transported by the circulatory system to a distant target organ to coordinate its physiology and behavior. Hormones serve as a major form of communication between different organs and tissues.".
- Hormone label "Hormon".
- Hormone label "Hormona".
- Hormone label "Hormona".
- Hormone label "Hormone".
- Hormone label "Hormone".
- Hormone label "Hormony zwierzęce".
- Hormone label "Hormoon".
- Hormone label "Ormone".
- Hormone label "Гормоны".
- Hormone label "هرمون".
- Hormone label "ホルモン".
- Hormone label "激素".
- Hormone sameAs Hormon.
- Hormone sameAs Hormon.
- Hormone sameAs Ορμόνη.
- Hormone sameAs Hormona.
- Hormone sameAs Hormona.
- Hormone sameAs Hormone.
- Hormone sameAs Hormon.
- Hormone sameAs Ormone.
- Hormone sameAs ホルモン.
- Hormone sameAs 호르몬.
- Hormone sameAs Hormoon.
- Hormone sameAs Hormony_zwierzęce.
- Hormone sameAs Hormona.
- Hormone sameAs m.03gv9.
- Hormone sameAs Q11364.
- Hormone sameAs Q11364.
- Hormone wasDerivedFrom Hormone?oldid=604342240.
- Hormone depiction Epinephrine_structure.svg.
- Hormone isPrimaryTopicOf Hormone.
