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← Nature & AnimalsWhich outcome reduces heat loss when a beaver is submerged in icy Arctic waters?
A)Hindfoot vasodilation constricts arterioles
B)Countercurrent heat exchange insulation increases
C)Peripheral vasoconstriction reduces flow✓
D)Increased brown fat UCP1 activation
💡 Explanation
Peripheral vasoconstriction minimizes heat loss at extremities because reduced blood flow limits convective heat transfer into the icy surround; therefore, core temperature remains stable, rather than dropping via conduction through blood.
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