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date: 27 May 2024

rete mirabile (wonderful net) ( pl. retia mirabilia) 

A Dictionary of Zoology

Michael Allaby

In mammals adapted to arctic and polar climates, a network of arteries and veins that lie side by side in the lower parts of the limbs. Warm arterial blood flowing towards the extremities warms venous blood flowing towards the heart, thus allowing the temperature in the extremities to fall close to the ambient, while reducing the energy expenditure needed to maintain the core temperature of the body. For example, when the air temperature is −30°C the paws of an arctic fox (... ...

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