Question

An entire body cavity filled with blood is called

Answer 1

Answer:

In tardigrade. …the tardigrade's body cavity (hemocoel) is filled with fluid that transports blood and oxygen (the latter of which diffuses through the animal's integument and is stored in cells within the hemocoel). The alimentary canal traverses the body from end to end.

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Answer 2

In circulatory system: Body fluids. …the blood-vessel walls; where a hemocoel (a blood-containing body cavity) exists, however, blood rather than coelomic fluid occupies the cavity. I think I helped u