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High school biology classes tell us that the circulatory system transmits blood and the digestive system transports food.
, however, sea spiders apparently skip this lesson: they use their intestines to transfer blood.
sea spiders are common inhabiters of the world's oceans and are known for their similarity to spiders on land.
researchers discovered this unusual physiological strategy after injecting dye into sea spiders and observing blood flow.
they noticed that the animal's heart beats very weakly.
however, the digestive system, which stretches abnormally in sea spiders (extending to each leg), contracts in waves, moving food in the intestines and blood in surrounding blood chambers (equivalent to veins and arteries).
experiment used samples of 12 sea spiders from Antarctica and the United States and confirmed that arthropods living in the ocean use intestinal contractions to promote blood and oxygen flow.
researchers report the findings in the journal Current Biology.
is not clear why the digestive system is responsible for this, but transporting food and blood through intestinal contractions may save energy.
sea spiders also have an unusual need to transport oxygen from their limbs to the core of the body because they lack gills and most of it is absorbed through the surface of long legs.
this is the first time researchers have found such a blood delivery system in nature, but the authors suspect that other animals may be doing something similar.
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