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205textnotes05 - e.g the plasma(increased/decreased...

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e.g, the plasma (increased/decreased) concentration of a factor X triggers the secretion of the hormone. In turn, the hormone affects the secretion of the factor X in target cells and controls its plasma level (e.g., parathyroid hormone, Fig.7-10 ). - More complex pathway: The hormone secretion and/or synthesis is under the control of multiple distinct stimuli (e.g., insulin, Fig 7-9 ). C.2. Pathway of neurohormones Neurohormones are synthesized and secreted by neurons: - posterior pituitary hormones ( Figs. 7-11, 7-12, 7-13 ), - hormones of the hypothalamus that control the release of hormones by the anterior pituitary ( Figs. 7-11, 7-13, 7-14, 7-15 ), - catecholamines made by the adrenal medulla. C.3. Pathway of hormones under trophic hormone control - tropic (Greek, trophikos, = nourishment) hormone. Definition of trophic hormone: Any hormone that controls the secretion of another hormone is trophic e.g., hormones of the anterior pituitary ( Figs. 7-13 7-14 ). C.4. Hormone interactions - Some hormones have a permissive action on the effects of other hormones.
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