Answer:
Heat stroke occurs when the body overheats, typically due to prolonged exposure to high temperatures or physical exertion in hot conditions. It can lead to a rapid increase in body temperature, causing symptoms like confusion, dizziness, a rapid heart rate, nausea, and even loss of consciousness. If not treated promptly, it can result in organ damage or even be life-threatening.
A situation where someone is more likely to experience heat stroke during physical activity is when exercising intensely in high temperatures without adequate hydration or breaks. For instance, running a marathon on a hot, humid day without proper hydration or inappropriately managing body temperature can significantly increase the risk of heat stroke.