A) more potassium ions enter the axon as compared to sodium ions leaving it
B) more sodium ions enter the axon 4 compared to potassium ions leaving it
C) all potassium ions leave the axon
D) all sodium ions enter the axon
Correct Answer: B
Solution :
When a nerve fibre is stimulated, its membrane becomes more permeable to sodium ions; hence, more sodium ions enter the axon than potassium ions leaving it. As a result, the positive and. negative charges on the outside and inside of the membrane are reversed. The membrane with reversed polarity is called depolarised.
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