At the sensory level, ______ are the specialized structures that are the basis for pain sensations, and ______ helps explain the actual perceptual experience of pain
a. nociceptors; gate-control theory
b. papillae; frequency theory
c. nociceptors; place theory
d. haptics; gate-control theory
Answer: A
Rationale: Our skin, teeth, cornea, and internal organs contain these nerve endings; according to this theory, cells in the spinal cord regulate how much pain signaling reaches the brain.
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