Final answer:
Heroin is an opioid that alleviates pain and generates a 'high' by mimicking endorphins and binding to opioid receptors in the brain. It has a high potential for abuse and is therefore tightly regulated.
Step-by-step explanation:
Heroin is an example of a(n) opioid. Opioids are substances that have analgesic properties, which means they decrease pain by mimicking the actions of endorphins in the brain. They bind to opioid receptors to reduce pain sensations and enhance feelings of pleasure and euphoria. Well-known opioids include morphine, codeine, and synthetically created drugs like oxycodone and hydrocodone. Heroin, in particular, produces a significant 'high' and has a high potential for abuse, leading to both psychological and physical dependency.
Heroin operates by connecting to opioid receptors located in the brain, spinal cord, and gastrointestinal tract, altering the perception of pain. Given the scope of opioid misuse and public health concerns, heroin and other opioids such as oxycodone are tightly regulated due to their addictive nature and potential for abuse.