Heroin and morphine stimulate synapses that normally respond to neurotransmitters that inhibit the sensation of pain. Those neurotransmitters are called

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Quizplus · Accepted Answer

The neurotransmitters that inhibit the sensation of pain are called endorphins. Heroin and morphine stimulate these synapses, which leads to their addictive and pain-relieving effects. Phenylalanines, testosterone, and glucagons are not involved in the pain-inhibiting pathways in the brain.

Heroin and Morphine Stimulate Synapses That Normally Respond to Neurotransmitters