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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.
In a previous paper comparing 155 species of snakes, weshowed. that the position of the heart relative to the head is statistically. related to both habitat usage and phylogenetic position (âPhy-. logeny, ecology, and heart position in snakes,â Physiological and. Biochemical Zoology 83:43â54).