Foramen Ovale and Ductus Arteriosus:

Although mom controls the oxygen source, the fetus has a couple of clever tricks to get the most oxygen possible. Watch how Foramen Ovale and the Ductus Arteriosus aid in fetal blood flow by simply bypassing the lungs! Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.

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