Description
我们人类正常情况下，每分钟心跳约70次，鲸鱼心跳每分钟仅10次——差不多是心跳最少的动物了，虽然鲸鱼心跳次数很少，但是鲸鱼们有一颗强大泵力的心脏。鲸鱼在海洋里生活了千万年，早就适应了海洋环境，由于鲸鱼体内拥有许多特殊的构造，使它能够长时间的在水中屏庄呼吸、减慢心跳速度，因此当它沉到海底，总要经过一段长时间后，才会再浮出水面。鲸类动物的共同特点是体温恒定，大约为36.0℃左右。皮肤裸出，没有体毛，没有汗腺和皮脂腺。皮下脂肪很厚，可以保持体温，并减轻身体在水中的比重。骨骼具有海棉状组织，体腔内有较多的脂肪，可以增大身体的体积，减轻身体的比重，增大浮力。
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