Neurons and Signals · Brain
The all-or-nothing electrical spike that travels down the axon.
When a neuron fires, it doesn't fire a little. It produces a spike of electrical activity that is essentially the same size every time — an all-or-nothing event, exactly like the muscle fibres you met in the Muscles module.
The spike travels down the axon by briefly letting charged particles rush across the membrane, then pumping them back. Because every spike is identical, a neuron can't signal 'strongly' by firing harder — it signals intensity by firing faster, and by how many neurons fire together.
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