The patient receives morphine for pain. He asks the nurse how it works to relieve pain. What is the best response by the nurse?
1. "It inhibits the primary pain neurotransmitters in your brain."
2. "It stimulates the receptors that secrete endorphins in your brain."
3. "It stimulates a receptor in your brain that induces pleasure."
4. "It promotes the primary pleasure neurotransmitters in your brain."
Correct Answer: 3
Rationale: Opioids exert their actions by interacting with the mu and kappa receptors in the brain. Drugs that stimulate these receptors are opioid agonists. Opioids do not promote release of the pleasurable neurotransmitters. Opioids do not promote secretion of endorphins. Opioids do not inhibit neurotransmitters responsible for pain.
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