A nerve impulse is an electrical signal that travels along a neuron, the basic unit of the nervous system. This signal is generated when a neuron is stimulated, causing a rapid change in electrical charge across its membrane. This process is known as action potential, and it allows the nerve impulse to move quickly from one part of the body to another. As the nerve impulse travels, it can trigger the release of neurotransmitters at the synapse, the junction between two neurons. These chemicals help transmit the signal to the next neuron, continuing the communication process throughout the nervous system. This rapid transmission is essential for functions such as movement, sensation, and reflexes.