Which term describes the receptors that detect temperature changes and signal thermoregulation?

• A. Mechanoreceptors
• B. Photoreceptors
• C. Nociceptors
• D. Thermoreceptors

Answer: (D)

Temperature regulation relies on thermoreceptors, specialized sensors that detect changes in temperature. Peripheral thermoreceptors in the skin respond to warmth and cold, while central thermoreceptors in the brain, especially in the hypothalamus, monitor core temperature. When they detect a change, they convert that thermal input into nerve signals that inform the brain’s thermostat, triggering appropriate responses such as shivering or increased metabolism to generate heat, or vasoconstriction, sweating, or vasodilation to lose heat. Other receptor types have different roles: mechanoreceptors sense mechanical forces like touch, photoreceptors detect light, and nociceptors respond to potentially damaging stimuli.