what is a circulatory system in which blood is not in vessels but spread over organs?

Question

dean.shyy · Answer

The circulatory system is just the circulatory system. There is not another circulatory term just for that spread over organs. However, blood vessels do branch into the a capillary system for certain areas within the circulatory system, or within organs.

anonymous · Answer

The circulatory system you describe exists among many invertebrates.  I'll give you a clue...a circulatory system with blood vessels delivering the blood is called a CLOSED circulatory system.  A circulatory like you describe, such as for a clam, is called ...