Question

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what happens when an action potential is generated?
there is a gradual influx of positively charged ions into the neuron
there is a sudden increase in the number of neurons in the brain
there is a sudden influx of negatively charged ions into the neuron
there is a sudden influx of positively charged ions into the neuron
the neuron stops firing

Explanation:

When an action potential is generated, there is a rapid (sudden) influx of positively - charged ions (such as sodium ions) into the neuron, which changes its membrane potential from negative to positive. This process is called depolarization.

Answer:

There is a sudden influx of positively charged ions into the neuron