Glossary O

Opioid are systems responsive to opiate drugs and similar chemicals

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opioid use disorder refers to cognitive, biological, behavioral, and social problems associated with the use and abuse of opiates and their synthetic variants.

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Opioids are substances that include morphine and heroin, producing euphoria followed by a tranquil state; in severe intoxication, can lead to unconsciousness, coma, and seizures; can cause withdrawal symptoms of emotional distress, severe nausea, sweating, diarrhea, and fever

Opium refers to the dried sap produced by the poppy plant

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Opium poppy is a plant cultivated for centuries, primarily in Eurasia, for Opium, a narcotic that acts as a central nervous system depressant

OPO refers to an organ procurement organization; one of the authorized local or regional agencies that implements procedures to offer the opportunity of organ donation and to recover donated organs

Opponent neurons is a neuron that has an excitatory response to wavelengths in one part of the spectrum and an inhibitory response to wavelengths in the other part of the spectrum.

Opponent-process theory refers to a theory which states that strong emotions tend to be followed by an opposite emotional state; also the strength of both emotional states changes over time.

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