question_answer

In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed, would drive

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.