The Four Chambers · Heart
The wall that keeps the two sides strictly apart.
Down the middle of your heart runs a solid wall of tissue, keeping oxygen-poor and oxygen-rich blood from ever mixing. That wall is the septum.
In a healthy heart the septum is a complete seal between the two sides. Before birth every baby has a natural opening in it (blood bypasses the unused lungs in the womb); it normally closes soon after birth.
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