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In an open circulatory system (e.g., Arthropods), blood is pumped into open spaces (hemocoel), facilitating direct diffusion of gases and nutrients. In a closed system (e.g., Annelids, Chordates), blood circulates within vessels.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Basis of Classification - Symmetry Coelom Segmentation
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