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众所周知,鱼类是冷血动物,体温随水温而变化。鱼在水中用鳃呼吸,获得氧气的同时,水流经鳃后带走了大量的热,使鱼体内不能贮存多余的热量。然而,一种叫黑金枪鱼的体温却能比水温高20℃,这是由于金枪鱼的血管网络中具有一个“热交换器”,血液进入鳃之前和出鳃后都要流经这个“热交换器”,在其中冷血与热血进行热传递,因而保存了体内的热量。
As we all know, fish are cold-blooded animals, body temperature varies with water temperature. Fish in the water with gills breathing, access to oxygen at the same time, the water flow through the gills took away a lot of heat, so that fish can not store excess body heat. However, the body temperature of a species called black tuna is 20 ° C above water temperature due to the “heat exchanger” in the tuna’s vascular network, which flows through the “heat exchanger before and after the gills enter the gills ”, In which cold and heat transfer of heat, thus preserving the body’s heat.