Opioid receptors are a type of receptor found in the central nervous system and throughout the body that respond to opioid chemicals such as endorphins, enkephalins, and exogenous opioids like morphine and heroin. Activation of opioid receptors leads to the modulation of pain perception, mood, and other physiological functions. Research in the area of opioid receptors often focuses on understanding the mechanisms underlying opioid addiction, tolerance, and dependence, as well as the development of novel opioid-based medications for pain management and addiction treatment. Additionally, researchers investigate the potential therapeutic benefits of targeting opioid receptors in various neurological and psychiatric disorders.