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NEET Sample Paper NEET Sample Test Paper-43

  • question_answer
    The electrical potential difference across the plasma membrane when concentration of \[{{K}^{+}}\] is high inside axon and low outside axon is called as the -

    A) Action potential 

    B) Resting potential

    C) Refractory potential        

    D) All of these

    Correct Answer: B

    Solution :

    These ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump which transports \[3\text{ }N{{a}_{+}}\]outwards for \[2\text{ }{{K}_{+}}\]into the cell. As a result, the outer surface of the axonal membrane possesses a positive charge while its inner surface becomes negatively charged and therefore is polarised. The electrical potential difference across the resting plasma membrane is called as the resting potential.


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