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Two atria and one ventricle make up the three-chambered heart of a snake. The right and left atria receive blood from the lungs and body, respectively, and pass it to the ventricle to be circulated again. Encased in a sac, called the pericardium, the heart is located at the branching of the bronchi.
One school of thought says that reptile hearts have two atria and one partially divided ventricle, while another says the reptile heart has two atria and two ventricles with an incomplete wall between the ventricles.   For the most part, they all have 3 chambers: 2 atria and one ventrical.