In the context of thermoregulation, how does homeostasis relate to hyperthermia?

• A. Hyperthermia occurs when homeostatic mechanisms for heat balance (heat loss vs. heat gain) are overwhelmed or fail, allowing core body temperature to rise above the normal set point.
• B. Hyperthermia occurs only when homeostasis is functioning perfectly, because vasoconstriction and shivering always increase heat loss.
• C. Homeostasis causes hyperthermia by intentionally raising the temperature set point through hypothalamic signaling, producing fever.
• D. Hyperthermia is the normal homeostatic response that lowers core body temperature below the set point during cold exposure.

Answer: (A)