Which circumstance allows marine mammals in cold Arctic waters counteract hypothermia due to radiative heat losses?

💡 Explanation

Countercurrent heat exchange increases thermogenesis in diving mammals because blood vessels near the skin constrict to shunt blood away from the cold surface, utilizing vasodilation to maintain core temperature, therefore heat loss is minimized rather than increased shivering for heat.

• Which outcome occurs when tidal volume decreases during avian crosscurrent respiration?
• Which consequence of increased metabolic demand in a tuna impacts the gill filaments?
• Which outcome occurs when a plant experiences prolonged magnesium deficiency inhibiting rubisco’s activity?
• Which mechanism assists cheetahs in sustaining high-speed pursuit?
• Which structural adaptation results when juvenile hormone diminishes sharply during pupae formation?
• Which developmental outcome results from the ablation of imaginal discs during larval stages of holometabolous insects?