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Heart of amphibian and fishes

How the amphibian heart is different from the fish heart?

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Heart of fish has two chambers, an atrium and a ventricle, and the blood which comes to it is solely venous where as in the amphibians there exist three heart chambers and there is arterial blood coming from lungs; heart of these animals has two atria: one which gets blood from the body and other one which gets blood from lungs and one ventricle; the arterial blood mixes with venous blood within the ventricle that in turn pumps the blood to lungs and to systemic circulation.

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