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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?

BHUBHU 2010

Solution:

Second messengers are the organic molecules and sometimes the metal ions, act as intracellular 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 $\left( Ca ^{2+}\right)$ also act as second messenger in phospholipase $C - Ca ^{+}$second messenger system.