BCECE Medical BCECE Medical Solved Papers-2013

  • question_answer
    Which one of the following is not a second messenger in hormone action?

    A)  cGMP  

    B)  Calcium

    C)  Sodium

    D)  cAMP

    Correct Answer: C

    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.


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