NEET AIPMT SOLVED PAPER SCREENING 2006

  • 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 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 \[(C{{a}^{2+}})\] also act as second messenger in phospholipase \[C-C{{a}^{+}}\] second messenger system.


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