Question

fill in the blank question
the action of a depends on the receptors at a particular synapse.
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Explanation:

Neurotransmitters are chemical messengers in the nervous system. Their effect (excitatory or inhibitory) at a synapse is determined by the specific receptors on the postsynaptic neuron. Different receptors bind to neurotransmitters in distinct ways, dictating the subsequent cellular response.

Answer:

neurotransmitter