Which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone?
A) endorphin
B) acetylcholine
C) serotonin
D) nitric oxide

Question

Quizplus · Accepted Answer

Endorphins are neurotransmitters that inhibit pain and are responsible for feelings of pleasure and well-being. Morphine, heroin, and methadone all mimic endorphins and bind to the same receptors in the brain, producing pain relief and euphoria. Acetylcholine and serotonin are not directly involved in pain modulation, and nitric oxide functions as a signaling molecule rather than a neurotransmitter.

Which of the Following Neurotransmitters Inhibits Pain and Is Mimicked