2026 AEMT Pharmacology Complete Practice Exam

Narcotics relieve pain by activating opioid receptors in the nervous system, especially in the brain and spinal cord. When these receptors are stimulated, they dampen the transmission of pain impulses at the spinal cord level and alter how the brain perceives pain, reducing both the sensation and the emotional response to it. This central action involves decreased release of neurotransmitters like substance P and glutamate and changes in neuron excitability, which together blunt the pain signal as it travels to the brain. In contrast, inhibiting prostaglandin synthesis is the mechanism of NSAIDs, which work peripherally to reduce pain mediators, and blocking opioid receptors would prevent analgesia rather than produce it.