How do thermoreceptors differ from other sensory neurons?

• A. They sense temperature.
• B. They sense pain.
• C. They sense sound.
• D. They send visual information.

Answer: (A)

Thermoreceptors are specialized receptors that detect changes in temperature and convert those thermal changes into neural signals that the brain interprets as warmth or cold. They’re part of the somatosensory system and help with both perception of temperature and body temperature regulation, using temperature-sensitive ion channels to transduce heat or cold into action potentials. This makes their role distinct from other sensory neurons that respond to different kinds of energy: pain receptors signal potentially damaging stimuli, mechanoreceptors detect mechanical pressure and vibrations (like touch and hearing), and photoreceptors in the eye detect light to form visual images. So the defining feature is that thermoreceptors specifically sense temperature.