During prolonged exertion in a hot environment, what causes heat stroke despite the activation of sweating and vasodilation?

💡 Explanation

Heat stroke occurs when the body's thermoregulation fails due to excessive heat exposure and exertion, leading to a dangerous rise in body temperature. Because sweat evaporation is impaired in high humidity, the primary cooling mechanism fails; therefore, the body overheats rapidly, rather than effectively dissipating heat through convection or radiation.

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