Opium and its derivatives duplicate the action of

• A. GABA.
• B. insulin.
• C. endorphins.
• D. acetylcholine.

Answer: (C)

Verified step by step guidance

1. Begin by understanding the role of opium and its derivatives in the brain. These substances are known to interact with neurotransmitter systems.
2. Identify the neurotransmitter systems that opium and its derivatives affect. They primarily influence the opioid receptors in the brain.
3. Recognize that endorphins are natural neurotransmitters that bind to opioid receptors, similar to opium and its derivatives.
4. Understand that endorphins are involved in pain relief and pleasure, which is why opium and its derivatives can mimic their effects.
5. Conclude that opium and its derivatives duplicate the action of endorphins by binding to the same receptors and producing similar effects in the brain.