What happens when a nerve impulse reaches a synapse?

Answer 1

Impulse reaches axonic end of synapse (impulse always travels from axon to dendron) #rarr# calcium ions flow in axonic terminal#rarr# secretory vescicles release neurotransmitter #rarr# dendritic end across synapse become depolarised #rarr# new impulse generated

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Answer 2

Jeremiah Allen

Neurotransmitters are released into the synaptic cleft in response to a nerve impulse, which makes it easier for the signal to reach the target cell or subsequent neuron.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.