Examlex
As the onset of labor approaches, estrogen is released by the placenta, and increases the number of oxytocin receptors.
Morphine
A powerful opiate analgesic drug derived from the poppy plant, used to relieve severe pain by acting directly on the central nervous system.
Opiates
A group of drugs derived from opium, used for their pain-relieving properties, but they can also be addictive.
Morphine
A powerful opioid analgesic drug derived from opium, used to relieve severe pain.
Heroin
An opioid drug made from morphine, a natural substance taken from the seed pod of the various opium poppy plants.
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