process of action potential in enabling the nerve impulse transmission
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As an action potential (nerve impulse) travels down an axon there is a change in polarity across the membrane of the axon. In response to a signal from another neuron, sodium- (Na+) and potassium- (K+) gated ion channels open and close as the membrane reaches its threshold potential.
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When in nerve fibre is stimulated, its membrane becomes more permeable to sodium ions .Hence more Sodium ion enters the axon and then potassium ions. As a result the positive and negative charges on the outside and inner side of the membrane gets reversed .
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