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.You need to login to perform this action.
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