Enkephalin is an opiate produced in the body. When enkephalin binds to opioid receptors, it produces analgesia (a lack of pain sensation). Morphine can also bind to opioid receptors and produce analgesia. Morphine is an opiate antagonist.

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Morphine is an opiate agonist, not an antagonist, because it activates opioid receptors to produce analgesia, similar to enkephalins.

Enkephalin Is an Opiate Produced in the Body