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Classification of circulatory system of reptiles

How circulatory system of the reptiles is characterized? Specify the basic difference between heart of the reptile and the amphibian?

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Circulatory system of beings of class Reptilia is same as that of the amphibian, incomplete and closed. However the heart have the three chambers : two atria and one ventricle, while in reptiles there is beginning of the ventricular septation and mixture of arterial with the venous blood is lessened.

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