Administration of a drug that binds with a postsynaptic receptor, but does not open ion channels would be termed a/an- Direct antagonist.
The receptors that are present in the plasma membrane or interior of the postsynaptic neuron is called a postsynaptic receptor.
Ion channel are the membrane protein that allow the movement of ions from one side of the membrane to the other side of it.
Direct antagonist binds to the neurotransmitter receptors in order to prevent neurotransmitter from attaching to the receptors in order to prevent the opening of the ion channel.
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