Pyrachan analyzes Barian Biology:  

It is assumed that all Barians have the same insides as Vector.

Although it is entirely possible that Barian’s have circulatory systems, they do not show that they have blood in their bodies. The red and blue markings will be referenced as ‘cords.’ instead of veins and arteries.

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If there’s anything I missed or I have gotten wrong, please tell me as soon as possible! Thank you and I hope this is useful/informative!