Which heat-related condition results from overexposure to heat stress and involves a total breakdown of the body's heat balance?

• A. Heat exhaustion
• B. Frostbite
• C. Heat rash
• D. Heat stroke

Answer: (D)

Heat stroke occurs when exposure to heat overwhelms the body's ability to regulate temperature, causing a total breakdown of the body's heat balance. The body's cooling systems fail, core temperature rises rapidly—often above 40°C (104°F)—and this can lead to brain and organ damage. Signs include sudden confusion or agitation, dizziness or fainting, fast or strong pulse, nausea, and skin that may be hot and dry or sweaty depending on the stage. It's a medical emergency requiring immediate cooling and professional care.

This differs from heat exhaustion, which is due to dehydration and salt loss with some remaining regulation of temperature, often with heavy sweating and cooler, clammy skin. Heat rash is a minor irritation from sweating, not a systemic failure. Frostbite is a cold-related injury from freezing of skin tissue, unrelated to heat stress.