Control of hormone production

Control of hormone production - hormones is discontinued...

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Control of hormone production Endocrine glands release hormones in response to one (or more) of the following stimuli:  Hormones from other endocrine glands Chemical characteristics of the blood (other than hormones) Neural stimulation Most hormone production is regulated by a  negative feedback  system. The nervous system and  certain endocrine tissues monitor various internal conditions of the body. If action is necessary to  maintain homeostasis, hormones are released, either directly by an endocrine gland or indirectly via  the action of the hypothalamus of the brain, which stimulates other endocrine glands to release  hormones. The hormones activate target cells, which initiate physiological changes that adjust body  conditions. When normal conditions have been restored, the corrective action (the production of 
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Unformatted text preview: hormones) is discontinued. Thus, in negative feedback, when the original (abnormal) condition has been repaired, or negated, corrective actions decrease or are discontinued. For example, the amount of glucose in the blood regulates the secretion of insulin and glucagons through negative feedback. The production of some hormones is regulated by positive feedback. In such a system, hormones cause a condition to intensify (rather than decrease). As the condition intensifies, hormone production increases. Such positive feedback is uncommon but does occur during childbirth (hormone levels build with increasingly intense labor contractions) and lactation (where hormone levels increase in response to nursing, which causes milk production to increase)....
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