Final answer:
Fetal circulation bypasses pulmonary circulation due to non-functional fetal lungs, using anatomical structures like the foramen ovale and ductus arteriosus.
Explanation:
Fetal Circulation Bypassing Pulmonary Circulation in the Unborn Fetal Pig: In the fetus, the pulmonary circulation is bypassed because the fetal lungs are not functional, and oxygen exchange occurs through the placenta from the mother's blood. This bypass is facilitated by anatomical structures like the foramen ovale and ductus arteriosus which allow blood shunting away from the lungs.
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