Double circulation

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the anatomy of the heart and lungs

Fetal Circulation Shunts: Placenta: Oxygenated rich blood from mother. Ductus Venosus: Shunts a portion of the left umbilical vein blood flow directly to the inferior vena cava and allows oxygenated blood from the placenta to bypass the liver. Foramen Ovale: Allows blood to enter the left atrium from the right atrium. Ductus Arteriosus: Blood vessel connecting the pulmonary artery to the aorta. Allows blood from the right ventricle to bypass the fetus' fluid-filled non-functioning lungs.

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