Frog hearts have a chamber where deoxygenated blood can mix with oxygenated blood. What structure in the human heart prevent such mixing? atria pericardium septum blood vessels

Frog hearts have a chamber where deoxygenated blood can mix with oxygenated blood. What structure in the human heart prevent such mixing?

atria
pericardium
septum
blood vessels

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Frog hearts have a chamber where deoxygenated blood can mix with oxygenated blood. What structure in the human heart prevent such mixing? atria pericardium septum blood vessels<…

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