Which brain region regulates body temperature?

Which brain region regulates body temperature?

• A. Hypothalamus
• B. Medulla oblongata
• C. Cerebellum
• D. Thalamus

Answer: (A)

Thermoregulation is governed by a brain region that acts as the body’s thermostat. The anterior hypothalamus, especially the preoptic area, continuously monitors core temperature and compares it to a set point. When temperature is above the set point, it triggers heat-dissipation responses such as vasodilation of skin vessels and sweating to shed heat. When temperature is below the set point, it promotes heat-conservation and production through vasoconstriction, shivering, and behaviors that help generate or retain warmth. This regulatory loop keeps core temperature within a narrow, optimal range. Fever illustrates this system: pyrogens raise the hypothalamic set point, so the body perceives itself as too cold and activates heat-producing responses until the new set point is reached. Other brain regions—like the medulla oblongata, which handles autonomic functions such as breathing and heart rate; the cerebellum, which coordinates movement; and the thalamus, which relays sensory information—do not set or adjust the body's temperature in the way the hypothalamus does.

Thermoregulation is governed by a brain region that acts as the body’s thermostat. The anterior hypothalamus, especially the preoptic area, continuously monitors core temperature and compares it to a set point. When temperature is above the set point, it triggers heat-dissipation responses such as vasodilation of skin vessels and sweating to shed heat. When temperature is below the set point, it promotes heat-conservation and production through vasoconstriction, shivering, and behaviors that help generate or retain warmth. This regulatory loop keeps core temperature within a narrow, optimal range.

Fever illustrates this system: pyrogens raise the hypothalamic set point, so the body perceives itself as too cold and activates heat-producing responses until the new set point is reached. Other brain regions—like the medulla oblongata, which handles autonomic functions such as breathing and heart rate; the cerebellum, which coordinates movement; and the thalamus, which relays sensory information—do not set or adjust the body's temperature in the way the hypothalamus does.