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Some fish do have a secondary heart located close to the tail end of their body. This is because fish have a single circulatory system which is inefficient in maintaining a high blood pressure from the heart to the gills to the body and back to the heart (unlike us who have a double circulatory system - blood is pumped to lungs, then back to heart and then to body before returning to the heart to repeat the process).

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16y ago

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