Which type of chemicals produced in the brain mimic the effects of morphine?

Endorphins are neuropeptides produced in the brain that play a crucial role in pain relief and the regulation of emotions. They bind to the same receptors in the brain as opiates, including morphine, which leads to similar effects such as analgesia (pain relief) and feelings of euphoria. This similarity in function is what allows endorphins to effectively act as natural painkillers, mimicking the effects of morphine without the side effects that come with synthetic opioids.

Dopamines are involved in reward and pleasure mechanisms but do not have the same pain-relieving properties as endorphins. Serotonins primarily influence mood, anxiety, and sleep, but again, they do not mimic the effects of morphine in terms of pain relief. Acetylcholine plays a role in muscle activation and many brain functions, but it does not share the opioid-like effects seen with endorphins. Thus, endorphins are recognized specifically for their ability to mimic morphine's effects.