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Nature & Animals

Which 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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