A(n)________ is a molecule that inhibits a neurotransmitter's action.

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An antagonist is a molecule that inhibits the action of a neurotransmitter by blocking its receptor site. This prevents the neurotransmitter from binding and activating the receptor, which effectively reduces its effects. An agonist, on the other hand, is a molecule that enhances or mimics the action of a neurotransmitter by binding to its receptor and activating it. Endorphins are a type of neurotransmitter that are involved in pain relief and pleasure sensations, but they are not specifically related to the action of antagonists. A motor neuron is a type of nerve cell that controls movement and is not directly related to neurotransmitter inhibition.

A(n)________ Is a Molecule That Inhibits a Neurotransmitter's Action