How is a message sent through a nerve?

A message is sent through a nerve via electrical impulses known as action potentials. When a neuron is stimulated, ion channels open, causing a rapid influx of sodium ions, which depolarizes the membrane. This depolarization travels along the axon as a wave, eventually reaching the axon terminals, where it triggers the release of neurotransmitters. These neurotransmitters then cross the synapse to transmit the signal to the next neuron.