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Once the action potential is triggered, the depolarization (2) of the neuron activates sodium channels, allowing sodium ions to pass through the cell membrane into the cell, resulting in a net positive charge in the neuron relative to the extracellular fluid.
What is an action potential?
If the input from another neuron is strong enough, the neuron can relay the signal to neurons farther along the chain. Signals are normally transported between neurons by a chemical known as a neurotransmitter. Within a neuron, a signal is carried by an action potential, which is a momentary inversion of the resting membrane potential (from the dendrite to the axon terminal).
Where does action potential occur?
An action potential occurs when information is transferred from a neuron's cell body and down an axon. Neuroscientists also refer to the action potential as a "spike" or a "impulse." The action potential, a surge of electrical activity, is brought on by a depolarizing current.
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