The circulatory fluid which is not found in blood vessels but flows into a body cavity or chamber is referred to as:

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Open systems are utilized in animals that have a reduced coelom and whose organs and cavity are not lined by an internal membrane.Therefore,cells are better able to exchange substances directly with surrounding fluid.The open system is so called because vessels transport blood (actually a mixture of blood and tissue fluid called hemolymph)to open places (termed sinuses)within the body cavity where it directly bathes the organs.

The Circulatory Fluid Which Is Not Found in Blood Vessels