When Fenesha breaks her ankle,the doctor gives her a drug that eases her pain by binding with endorphin receptors.The drug that she takes is an endorphin ____.

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An agonist is a drug that binds to a receptor and triggers a response in the cell, in this case, binding to endorphin receptors to ease pain. An antagonist blocks the receptor, preventing any response. Reuptake blockers prevent the re-absorption of neurotransmitters, increasing their concentration in the synapses. Stimulants enhance neurotransmitter activity but do not necessarily bind to a receptor.

When Fenesha Breaks Her Ankle,the Doctor Gives Her a Drug