Identify the correct statement regarding the neural mechanism of pain
1. Once the pain impulse reaches the spinal cord, neurotransmitters inhibit the signal.
2. Alpha fibers are wrapped in myelin; C fibers are not.
3. When tissues are damaged, pain impulses go directly to the brain via alpha and beta fibers.
4. Myelin is a substance that slows nerve transmission.
2
Rationale 1: Once the impulse reaches the spinal cord, neurotransmitters pass the message along to the next neuron.
Rationale 2: The alpha fibers are wrapped in myelin; the C fibers are not.
Rationale 3: A pain impulse travels to the spinal cord via alpha and C fibers.
Rationale 4: Myelin is a lipid substance that speeds nerve transmission.
Global Rationale: A pain impulse travels to the spinal cord via alpha and C fibers. The alpha fibers are wrapped in myelin (a lipid substance that speeds nerve transmission); the C fibers are not. Once the impulse reaches the spinal cord, neurotransmitters pass the message along to the next neuron.
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