In the fetal heart, oxygenated and deoxygenated blood mix together in the heart (purple), while in the newborn, deoxygenated blood (blue) flows through the right side of the heart and oxygenated blood (red) through the left. — Wikimedia Commons
Around a quarter of us – one in four – walk around with a gap in our hearts. Yes, a literal gap.
It is a remnant of our time in the womb, when when the fetal lung is not yet matured and functioning.
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