天气预报 > 自然 > 鱼嘴巴一张一合在干嘛
鱼嘴巴一张一合在干嘛
更新时间: 2021-02-25 22:15:56  

1、鱼的嘴巴之所以是一张一合的,是因为鱼儿需要呼吸。

2、这种动物没有肺,呼吸的器官是它的鱼鳃,水流经过的鱼鳃时,鳃丝内的血管会进行气体交换,获取水体中的氧气呼吸。值得一提的是,也有一些鱼类有辅助呼吸器官,可以通过皮肤、肠道以及鳃上器等吸收氧气。

关键词: 嘴巴

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