Which mechanism most directly causes decreased insulation from fur in mammals experiencing extreme hyperthermia?

💡 Explanation

When a mammal overheats to hyperthermia, the pilomotor muscles relax, causing hairs to flatten, through cessation, which decreases the fur insulation's effective thickness maximizing surface exposure due to heat radiating. Therefore pilomotor cessation causes insulation reduction, not vasodilation, consumption, or decreased flow themselves (which influence heat in different manner).

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