Transmission of Nerve Impulse

Transmission of Nerve Impulse

Impulse is a self-propagated electrical signal that travels along the length of the neuron for passage of a message. At rest, a neuron is polarized with a positively charged exterior and negatively charged interior. As soon as it receives a stimulus, the neuron region undergoes depolarization with outer surface becoming negatively charged and the inner surface becoming positively charged. This happens due to opening of ion channels causing entry of Nations inside the nerve.

The depolarized region functions as a local current or stimulus which depolarizes the next part of the nerve while itself becoming polarized. The process continues till the impulse reaches the end of the neuron. From here impulse jumps to the next neuron, muscle or another target organ with the help of chemicals (e.g., acetylcholine) called neurotransmitters.