Action Potentials and Neuron Firing

I was wondering if you could explain how a neuron fires as well as reuptake mechanisms, agonists, and antagonists?

A neuron fires when a certain threshold is met to fire an action potential, which send a neurotransmitter through the axon, across the synapse, and to the dendrites of the next neuron.

Re-uptake is the excess neurotransmitter caught in the synapse gap being essentially recycled and coming back into the neuron.

Agonists excite neurotransmitter action, whereas antagonists inhibit neurotransmitter action.

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