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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.
Systemic venous return. Snakes have both renal and hepatic portal circluations. Jugulars are located anterior to the heart near the trachea and may be cannulated by a cutdown procedure. The right jugular is larger than the left. Blood returns to the heart from the systemic circulation through the sinus venosus. Find out more about the snake respiratory system.