Synapse: neurones transmit electrical impulses, the synapse is a gap between 2 neurones, triggering the release of , electrical impulses trigger the release of neurotransmitters which diffuse across the synapse, neurotransmitters are a chemical signal, neurotransmitters bind to receptors on the next neurone, the neurotransmitter binding triggers an electrical impulse in the next neurone, Effect of painkillers: prevent neurotransmitters binding to receptors in the next neurone, electrical impulse is not triggered, signal is not received by the central nervous system, person does not feel pain,

How a signal is transmitted at a synapse and how painkillers reduce pain felt by aperson

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