Partition dividing the heart into right and left.

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The partition dividing the heart into right and left is the septum. It acts as a wall between the two sides, with two main parts: the interatrial septum between the atria and the interventricular septum between the ventricles. This division helps keep deoxygenated blood on the right separate from oxygenated blood on the left, supporting efficient circulation. The other terms refer to the chambers themselves (atria and ventricles) or to the heart’s muscular wall (myocardium), not the dividing structure.