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← Nature & AnimalsWhich outcome occurs locally in marine mammals when core body temperature risks dropping below thermal equilibrium?
A)Contralateral arteriovenous heat exchanger activates immediately
B)Vasodilation near blubber reroutes more blood✓
C)Shivering thermogenesis increases metabolic heat production
D)Countercurrent exchange maximizes heat retention
💡 Explanation
Vasodilation increases blood flow near the blubber layer because it shunts core heat to the periphery, warming the skin. This protects against hypothermia; therefore vasodilation near the blubber occurs, rather than arteriovenous heat exchange or additional metabolic heat.
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