A)
into the cell
B)
and 
out of the cell
C)
into the cell
D)
out of the cell
Correct Answer: A
Solution :
In a resting nerve fibre, Na+ and
predominate in the extracellular fluid, whereas K+ predominate in the intracellular fluid (within the fibre). Na" are 10 times more outside the neuron and K+ ions are 25 times more inside the cell. Thus, it makes a considerable difference between the ion concentration outside and inside the plasma membrane. The plasma membrane is electrically positive outside and negative inside. This difference is called potential difference.
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