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  4. Which one of the following is not a second messenger in hormone action?

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Q. Which one of the following is not a second messenger in hormone action?

Bihar CECEBihar CECE 2013

Solution:

Second messengers are the organic molecules and sometimes the metal ions, acting as intracelluiar signals, whose production or release usually amplifies a signal such as a hormone, received at the cell surface. Sodium (Na) is not a second messenger in hormone action. Cyclic Adenosine Monophosphate (cAMP) was the first second messenger to-be discovered. In addition to cyclic AMP, Cyclic Guanosine Monophosphate (cGMP) functions as a second messenger in certain cases. Calcium ions $ (C{{a}^{2+}}) $ also act as second messenger in phospholipase $ C-C{{a}^{+}} $ second messenger system.