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Characterization of circulatory system of reptiles

How the circulatory system of reptiles is characterized? What is the fundamental difference between the amphibian and reptile heart?

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The circulatory system of beings of class Reptilia is identical to amphibian, closed and not complete. Though the heart presents three chambers (that is, two atria and one ventricle) in reptiles there is a starting of ventricular septation and the mix of arterial with venous blood is diminished.

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