Mammalian, bird, and crocodile hearts have four chambers with two separate atria and ventricles to ensure _____ different circuits for blood flow.
Question: Mammalian, bird, and crocodile hearts have four chambers with two separate atria and ventricles to ensure _____ different circuits for blood flow.
Mammalian, bird, and crocodile hearts have four chambers with two separate atria and ventricles to ensure two different circuits for blood flow. The two circuits are the pulmonary circuit and the systemic circuit. The pulmonary circuit carries deoxygenated blood from the heart to the lungs, where it is oxygenated, and then returns oxygenated blood back to the heart. The systemic circuit carries oxygenated blood from the heart to the rest of the body, where it delivers oxygen and nutrients to the tissues, and then returns deoxygenated blood back to the heart.
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