The anatomy and physiology instructor is talking about pain sensations. What produces pain sensations when stimulated by generating nerve impulses? (Select all that apply)
A) A-delta fibers
B) D-delta sensory nerves
C) Mu receptors
D) Sigma-receptors
E) C fibers
A, E
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Two small-diameter sensory nerves, A-delta and C fibers, respond to stimulation by generating nerve impulses that produce pain sensations. Large-diameter sensory nerves (i.e., A fibers) transmit sensations associated with touch and temperature. Mu-receptors are primarily pain-blocking receptors; sigma-receptors cause papillary dilation and may be responsible for the hallucinations, dysphoria, and psychoses that can occur with narcotic use.
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