A 10-year-old boy cuts his finger with a pocketknife and immediately applies pressure to the damaged area with his other hand to partially alleviate the pain. Inhibition of pain signals by tactile stimulation of the skin is mediated by which type of afferent neurons from mechanoreceptors?
AAδ
BType C
CAβ
DAα
Which substance enhances the sensitivity of pain receptors but does not directly excite them?
APotassium ions
BProstaglandins
CBradykinin
DSerotonin
Stimulation of which of the following areas of brain is experimentally used to control intractable pain -
AMesencephalon
BSubthalamic nucleus
CPeriaqueductal grey matter
DMedial forebrain bundle
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