NEET Biology NEET PYQ-Neural Control and Coordination

  • question_answer
    In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive:           [AIPMT (S) 2004]

    A) \[{{K}^{+}}\]into the cell

    B) \[{{K}^{+}}\]and \[N{{a}^{+}}\]out of the cell

    C) \[N{{a}^{+}}\]into the cell

    D) \[N{{a}^{+}}\] out of the cell

    Correct Answer: C

    Solution :

    [C] In the resting nerve fibre, the cytoplasm inside the axon has a high concentration of K+ and a low concentration of Na+ in contrast to the fluid outside the axon. Thus if diffusion occurs then through concentration gradient Na+ enters the fibre.


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