Polymodal nociceptors respond to what types of stimuli?

• A. Mechanical stimuli only
• B. Electrical stimuli
• C. Light stimuli
• D. Combinations of mechanical, thermal and chemical stimuli

Answer: (D)

Polymodal nociceptors are pain-detecting neurons that respond to more than one kind of noxious input. They are activated by mechanical forces like pressure or pinch, by extreme temperatures, and by chemical irritants released during inflammation. Because they can be triggered by several different harmful signals, they often respond to combinations of mechanical, thermal, and chemical stimuli. This makes them more versatile than fibers that respond to a single modality. Light or electrical stimulation isn’t the typical driver of these receptors, so the best description is that they respond to combinations of mechanical, thermal, and chemical stimuli.