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Explain amplification of a signal in hormone action? What is its role ?

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Although hormones are present in very small amounts, they effectively regulate many physiological processes. This is the result of signal amplification, an increase in signal strength. For example, a single hormone-receptor complex can stimulate the production of many cAMP molecules. In turn each cAMP can activate a protein kinase that phosphorylates many protein molecules. In this way, a single hormone molecule can activate many proteins.

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