What is double circulation and single circulation? Which event is more useful?
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The heart is the key organ for blood circulation and the double circulation is an efficient way of circulation as it provides an effective way of circulation. The main difference is that the blood follows two routes – one for oxygenated blood and the other for deoxygenated blood.
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In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart (single circulation). ... However, they get mixed up in the single ventricle which pumps out mixed blood (incomplete double circulation).
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