Once the inside of an axon becomes positively charged relative to the outside of the axon, ion channels open, allowing sodium ions to leave the axon.

Name: Once the inside of an axon becomes positively charged relative to the outside of the axon, ion channels open, allowing sodium ions to leave the axon.
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When the inside of an axon becomes positively charged, it is due to sodium ions entering the axon, not leaving. This process is part of the action potential mechanism in neurons.

Once the Inside of an Axon Becomes Positively Charged Relative