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- W2080202535 abstract "Extensive arterio‐venous associations occur in the head, axillae and legs of the Jackass penguin Spheniscus demersus. These vascular arrangements appear to facilitate counter‐current heat exchange. The major heat exchange system in the head is the post orbital rete mirabile formed by the superior orbital artery. Blood from this rete supplies the eye, nasal passages and superficial jaw muscles. Other blood vessels supplying the superficial areas of the head and mouth associate closely with their corresponding veins. In the axilla the brachial artery divides to form a humeral plexus of parallel running arteries each associating with up to three interlinking veins. Only the marginal vein does not associate with an artery. It appears that a shunt mechanism, which bypasses the veins in the humeral plexus, functions to permit heat loss when required; for instance in a heat‐stressed bird breeding or moulting on land. In both the upper and lower leg all the major arteries and their branches associate closely with corresponding veins. The development of these arterio‐venous associations indicates that Spheniscus demersus is adapted to a cool aquatic environment in which heat retention is of prime importance." @default.
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- W2080202535 date "1975-02-01" @default.
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- W2080202535 title "Arterio‐venous heat exchange systems in the Jackass penguin <i>Spheniscus demersus</i>" @default.
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- W2080202535 doi "https://doi.org/10.1111/j.1469-7998.1975.tb01398.x" @default.
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