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← Nature & AnimalsWhich physiological response occurs as ambient temperature increases and core body temperature approaches upper threshold in desert mammals?
A)Peripheral vasodilation for heat dissipation✓
B)Increased shivering thermogenesis in muscles
C)Activation of brown adipose tissue metabolism
D)Suppressed antidiuretic hormone excretion
💡 Explanation
As ambient temperature rises, peripheral vasodilation occurs because the hypothalamus detects increasing core temperature, triggering dilation of blood vessels near the skin to radiate heat. Therefore vasodilation aids heat dissipation, rather than shivering that generates heat, and BAT catabolism primarily used during arousal from hibernation, while ADH excretion is triggered by severe dehydration.
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