What occurs along an axon following a membrane reaching threshold potential?

When the membrane of an axon reaches threshold potential, voltage-gated sodium channels open, allowing sodium ions (Na⁺) to rush into the neuron. This influx of positive charge causes depolarization, which propagates along the axon as an action potential. As the membrane potential peaks, sodium channels close, and voltage-gated potassium channels open, allowing potassium ions (K⁺) to exit the cell, repolarizing the membrane. This sequence of events enables the rapid transmission of electrical signals along the axon.