Learn how Hormones Work in this educational video from dizzo95.
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Male Speaker: Hormones act as chemical messengers and are secreted into the blood stream by the endocrine glands for distribution around the body each hormone acts only upon specific types of cells those bearing the correct membrane receptor sites. These are the target cells fro the hormone within the blood stream there are many different hormones when specific receptor sites are not filled cells remained turned off. As hormones attach to receptor sites they initiate a switch on reaction in the cell cytoplasm this reaction is usually the production of the chemicals cyclic adenosine monophosphate or cyclic AMP from ATP. Cyclic AMP acts as a messenger within the cell to activate the cells production lines. The activity in the blood stream of some hormones such as adrenaline may last for only ten minutes other including some sex hormones have longer life, hormones may be inactivated by the target cells or by the liver and the breakdown products when their actions have been completed are either excreted or reused in the further manufacture of hormones.