For 10 points, name these substances whichinclude heroin and morphine, which are often used as painkillers.
One class of these substances are all derivatives of thebaine, and Salvinorin works as anantagonist to one of these substances' receptors. The substantia gelatinosa contains several receptorsfor these substances, which are released from the periaqueductal gray in the midbrain. Thesesubstances bind to namesake delta, kappa, and mu receptors. Naloxone and naltrexone can reversethe effects of overdose of these substances, which is fatal via respiratory (*) depression. Endogenouspeptides that mimic these substances include dynorphins, enkephalins, and endorphins. This class ofsubstances takes its name from alkaloid products of the poppy. For 10 points, name these substances whichinclude heroin and morphine, which are often used as painkillers.
One class of these substances are all derivatives of thebaine, and Salvinorin works as anantagonist to one of these substances' receptors.
opioids [or opiates; accept endorphins, dynorphins, or enkephalins before mention; prompt on "analgesics" or "painkillers"]