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← Nature & AnimalsWhich physiological outcome occurs when an endothermic mammal encounters sudden intense heat stress?
A)Peripheral vasodilation increases heat dissipation✓
B)Metabolic rate increases via shivering
C)Insulation thickens via subcutaneous fat
D)Countercurrent heat exchange reduces heat loss
💡 Explanation
When exposed to intense heat, peripheral vasodilation occurs because blood vessels widen near the skin surface, increasing convective heat transfer from the body to the environment. Therefore, vasodilation enhances heat dissipation, rather than shivering, insulation thickening, or countercurrent exchange which conserve heat.
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