Which phenomenon causes elevated thermal radiation from a mammal's ears during strenuous exercise in cold temperatures?

💡 Explanation

During exercise in cold temperatures, peripheral vasodilation increases blood flow to the ears for heat dissipation because core body temperature rises above a regulated setpoint, activating mechanisms necessary to cool the organism or cell. Therefore, increased thermal radiation results, rather than insulation, restricted heat exchange, or reduced metabolic heat, which either limit or reduce heat dissipation.

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