Which mechanism triggers increased cutaneous vasodilation in mammals exposed to heat?

💡 Explanation

When exposed to heat, the hypothalamus initiates cutaneous vasodilation by reducing sympathetic tone because this pathway lowers norepinephrine release, causing smooth muscles in blood vessel walls to relax. Therefore vasodilation results, rather than vasoconstriction increase, metabolic heating, or shivering which are mechanisms to conserve or generate heat.

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