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Morphine and fentanyl bound to mu-opioid receptors
Illustration of morphine (left, red) and fentanyl (right, red) molecules binding to mu-opioid receptors (blue) in a cell membrane. Opioid receptors are found on nerve cells. When pain is detected by the body, endorphins are released and attach to the receptors, starting a reaction that modulates pain perception. Opioid drugs such as morphine and fentanyl mimic endorphins., by JUAN GAERTNER/SCIENCE PHOTO LIBRARY
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