Neural Control and CoordinationMedium
Question
An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed, becuause
Options
A.more potassium ions enter the axon as compared to sodium ions leaving it
B.more sodium ions enter the axon as compared to potassium ions leaving it
C.all potassium ions leave the axon
D.all sodium ions leave the axon
Solution
When a nerve fibre is stimulated, its membrane becomes mor 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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