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乐乐告诉你在水里鱼的嘴巴常常一开一合,其实,那是为了让水快速流过它的呼吸器官——鳃,以便吸取水中的氧气,释放出体内的二氧化碳。水中的鱼要不要喝水呢?生活在淡水中的鱼,由于渗透压的缘故,水会渗入鱼体内,所以淡水鱼不仅不喝水还要及时排除多余的水分;而生活在海水中的鱼,却经常需要喝水。因为渗透压的不同,海水会拼命吮吸海水鱼体内的水分,所以它们要喝水。海水鱼喝水的方式是:水分先由口进入肠内,通过肠壁的渗透作用再进入体内,增加体液中的水
Lele tells you that the mouth of a fish is often opened in the water. In fact, it is to allow water to flow rapidly through its gill, its breathing organ, to absorb the oxygen in the water and release the body’s carbon dioxide. Water fish do not drink it? Living in freshwater fish, due to osmotic pressure, the water will penetrate into the body of the fish, so not only do not drink freshwater fish, but also the timely removal of excess water; and living in the sea of fish , But often need to drink water. Because of the difference in osmotic pressure, the sea water desperately sucks the water inside the saltwater fish, so they want to drink water. The way the saltwater fish to drink water is that the water first enters the intestine through the mouth and then enters the body through the osmotic effect of the intestinal wall to increase the water in the body fluid