Keyword Analysis & Research: nerve impulses define

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What is a nerve impulse called?

Transmission of a nerve impulse is called an action potential and is conducted by a part of the nerve cell, or neuron, that is like a long cord and is called an axon. At the end of the axon are axon terminals that lead to a synapse. This is where neurotransmitters, chemical messengers, transfer the … ( Full Answer )

What causes a nerve impulse?

Neurones send messages electrochemically; this means that chemicals (ions) cause an electrical impulse. Neurones and muscle cells are electrically excitable cells, which means that they can transmit electrical nerve impulses.

What occurs first in a nerve impulse?

As an action potential (nerve impulse) travels down an axon there is a change in polarity across the membrane of the axon. In response to a signal from another neuron, sodium- (Na+) and potassium- (K+) gated ion channels open and close as the membrane reaches its threshold potential.

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