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Thermoregulation
Most sharks are "cold-blooded" or, more precisely, poikilothermic, meaning that their internal body temperature matches that of their ambient environment. Members of the family Lamnidae (such as the shortfin mako shark and the great white shark) are homeothermic and maintain a higher body temperature than the surrounding water. In these sharks, a strip of aerobic red muscle located near the center of the body generates the heat, which the body retains via a countercurrent exchange mechanism by a system of blood vessels called the rete mirabile ("miraculous net"). The common thresher and bigeye thresher sharks have a similar mechanism for maintaining an elevated body temperature.[44] Larger species, like the whale shark, are able to conserve their body heat through sheer size when they dive to colder depths. The scalloped hammerhead closes its mouth and gills when diving to depths of around 800 metres, holding its breath until it reaches warmer waters again.[45]
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