Which neural structure acts as the central thermostat for thermoregulation, and which subregion senses core temperature to regulate responses?

Which neural structure acts as the central thermostat for thermoregulation, and which subregion senses core temperature to regulate responses?

• A. The brainstem, specifically the dorsal medulla.
• B. The hypothalamus, particularly the preoptic/anterior hypothalamus.
• C. The cerebral cortex, especially the prefrontal area.
• D. The amygdala, especially the central nucleus.

Answer: (B)

Thermoregulation is coordinated by the hypothalamus, which acts as the body's thermostat. In the hypothalamus, the preoptic area and anterior hypothalamus contain warm-sensitive and cold-sensitive neurons that monitor the body's core temperature. These neurons compare the sensed core temperature to a set point and trigger corrective responses to bring temperature back toward that set point. When core temperature rises, warm-sensitive neurons promote heat-dissipation mechanisms like skin vasodilation and sweating, and they can influence behavior to seek cooling. When temperature falls, cold-sensitive neurons drive heat-conserving and heat-producing responses such as vasoconstriction and shivering. They receive input from peripheral skin thermoreceptors and central sensors to coordinate these adjustments. The brainstem provides the actual autonomic and motor outputs to execute these responses, while higher cortical areas and the amygdala can modulate behavior or emotional responses to temperature but do not establish the regulatory set point.

Thermoregulation is coordinated by the hypothalamus, which acts as the body's thermostat. In the hypothalamus, the preoptic area and anterior hypothalamus contain warm-sensitive and cold-sensitive neurons that monitor the body's core temperature. These neurons compare the sensed core temperature to a set point and trigger corrective responses to bring temperature back toward that set point. When core temperature rises, warm-sensitive neurons promote heat-dissipation mechanisms like skin vasodilation and sweating, and they can influence behavior to seek cooling. When temperature falls, cold-sensitive neurons drive heat-conserving and heat-producing responses such as vasoconstriction and shivering. They receive input from peripheral skin thermoreceptors and central sensors to coordinate these adjustments.

The brainstem provides the actual autonomic and motor outputs to execute these responses, while higher cortical areas and the amygdala can modulate behavior or emotional responses to temperature but do not establish the regulatory set point.