What is the initial physiological reaction of the body to elevated external temperatures?

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Onset of sweatingExpansion of blood vessels (vasodilation)Reduction in heat generationActivation of non-shivering thermogenesisIncreased respiratory rate

Explanation

When exposed to high environmental temperatures, the body first responds by dilating blood vessels (vasodilation) to increase blood flow to the skin, facilitating heat loss. Sweating and other mechanisms follow subsequently.