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Amphibian and reptile heart

Compare amphibian heart over reptile heart?

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The reptiles have double and incomplete circulation too; three heart chambers (one ventricle and two atria). The reptile heart however represents the beginning of a ventricular septation that partially separates a right and left region of chamber. With partial ventricular septation mixture of the arterial with venous blood in the reptile heart is less than in amphibians.

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