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