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an action will happen cause of axo-axonal syanapse,which can facilitate the nerve impulse transmitting from presynaptic membrane to post synaptic membrane.

In the axo-axonal synapse one axon is secreting serotonin which can influence to close some of K+ channels in the other neuron to maintain a prolonged action potential by slowing down the repolarization.

as long as action potential is there it can stimulate the presynaptic membrane to release neurotransmitters towards postsyanptic membrane so prolonged action potential will help to stimulate more the Post synaptic membrane and give a strong impulse this is called presynaptic facilitation

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