During prolonged strenuous exercise in high humidity, why does heat stroke become more likely as sweat rate plateaus despite a rising core temperature?

💡 Explanation

Heat stroke becomes more likely because of the thermoregulation mechanism's failure to remove sufficient latent heat from sweat evaporation. Rising humidity reduces evaporation efficiency. Therefore, heat accumulates, rather than being dissipated, even if sweat production is high, making option D correct.

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