Which option accurately describes the primary mechanism of action of acetaminophen?

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Multiple Choice

Which option accurately describes the primary mechanism of action of acetaminophen?

Acetaminophen works mainly in the brain by inhibiting prostaglandin synthesis there, which reduces pain signaling and lowers the hypothalamic set-point for fever. This central action produces analgesia and antipyresis while having only minimal effect on inflammation in peripheral tissues, explaining why it lacks strong anti-inflammatory activity. Opioids relieve pain by activating mu opioid receptors, which is not how acetaminophen works. Blocking histamine release describes antihistamine effects, not acetaminophen’s action. A peripheral COX-2 blockade would yield noticeable anti-inflammatory effects outside the CNS, which acetaminophen does not provide.

Acetaminophen works mainly in the brain by inhibiting prostaglandin synthesis there, which reduces pain signaling and lowers the hypothalamic set-point for fever. This central action produces analgesia and antipyresis while having only minimal effect on inflammation in peripheral tissues, explaining why it lacks strong anti-inflammatory activity.

Opioids relieve pain by activating mu opioid receptors, which is not how acetaminophen works. Blocking histamine release describes antihistamine effects, not acetaminophen’s action. A peripheral COX-2 blockade would yield noticeable anti-inflammatory effects outside the CNS, which acetaminophen does not provide.

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