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Science:海蜘蛛用肠道运送血液

摘要 : 高中生物课告诉我们,循环系统传送血液,消化系统运送食物。不过,海蜘蛛明显跳过了这一课:它们利用肠道传送血液。

 

高中生物课告诉我们,循环系统传送血液,消化系统运送食物。不过,海蜘蛛明显跳过了这一课:它们利用肠道传送血液。

海蜘蛛是全球海洋的常见居住者,因和陆地上的蜘蛛相似而获得该名字。研究人员在将染料注入海蜘蛛体内并且观察血液流动后,发现了这种不同寻常的生理上的策略。他们注意到,这种动物的心脏跳动得很微弱。然而,在海蜘蛛中异常伸展(延伸到每条腿)的消化系统呈波浪形收缩,从而移动肠道内的食物以及周围血腔(相当于静脉和动脉)中的血液。

另外一项试验利用了12只来自南极和美国的海蜘蛛样本,并且证实这种居住在海洋中的节肢动物利用肠道收缩推进血液和氧气的流动。研究人员在日前出版的《当代生物学》杂志上报告了这一发现。为何消化系统承担了这一工作目前尚未明了,但通过肠道收缩运送食物和血液或许能节约能量。

海蜘蛛还有一种不同寻常的需求,即把氧气从四肢运送到身体的核心,因为它们缺少腮,大部分氧气通过长腿表面扩散被吸收。这是研究人员首次在自然界中发现此类血液运送系统,但论文作者怀疑,其他动物可能也在做一些类似的事情。

原文链接:

Meet the only animal known to pump blood with its guts

原文摘要:

High school biology classes teach us that the circulatory system pumps blood and the digestive system pumps food. But sea spiders (pictured) apparently skipped that lesson: They pump blood using their guts. Researchers discovered the remarkable physiological strategy after injecting dye into sea spiders—common inhabitants of the world's oceans named for their resemblance to land-based spiders—and watching the flow of blood. They noticed that the animals’ hearts were beating weakly. But the digestive system—which is unusually extensive in sea spiders, running down each leg—was contracting in waves, moving food in the gut as well as blood in the surrounding hemocoel cavity, the spider equivalent of veins and arteries. Additional experiments using 12 sea spider species from Antarctica and the United States confirmed that gut contractions propel the flow of blood and oxygen in this group of marine-dwelling arthropods, the team reports today in Current Biology. It’s not clear exactly why the digestive system does the job, but it could save energy having gut contractions move food and blood. Sea spiders also have an unusual need to move oxygen from their extremities to the core of their bodies because they lack gills, and most oxygen is taken up by diffusion through the surface of their long legs. It’s the first time a blood-pumping system like this has been found in nature, but the authors suspect that other animals may do something similar.

来源: Science 浏览次数:0

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