首先虾有血液,所以会流血。但是为什么看不到虾流血呢?因为虾的血液是白色的,或者是不易察觉的淡蓝色(河虾)。我们知道,人的血液是红色的,因为含有血红蛋白,血红素,含有铁卟啉环。在一些无脊椎动物中,多数动物的血液不含血红蛋白,如软体动物(头足动物和石鳖属等)以及节肢动物(虾、蟹及肢口纲的鲎)所含的是血蓝蛋白。血蓝蛋白分子由Cu2+和1个约200个以上氨基酸的肽链结合而成,和血红蛋白一样,该呼吸色素的颜色也与其状态有关,在氧和状态下为蓝色,在非氧和状态下则为无色或白色,铁离子的位置被铜离子取代,所以显淡蓝色,因为血量少,所以几乎看不到颜色。严格滴说,虾没有脊椎动物意义上的血液,虾和昆虫一样有的是"血淋巴"。虾和昆虫没有完整而封闭的血管系统,更没有淋巴,器官都是泡在血淋巴中,血淋巴起到血液和淋巴液的作用,缓慢循环流动。另外,虾利用血蓝蛋而不是血红蛋白白运送氧气,因而也就没有红色的“血液”。所以马马虎虎地把虾的"血淋巴"当做平常意义上的体液也行,当颜色不明显的血液也成。
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