Opiates such as morphine and codeine both contain molecules that are similar to endorphins, the body's natural painkillers. Opiates and morphine bind to receptor sites that are keyed to endorphins and trigger pain-reducing responses. Given these characteristics, both codeine and morphine would be classified as

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Codeine and morphine act as agonists because they bind to the same receptor sites as endorphins, triggering similar pain-reducing responses in the body.

Opiates Such as Morphine and Codeine Both Contain Molecules That