OB/PEDS 217 - Peds Test 3 Study Guide.

OB/PEDS 217 - Peds Test 3 Study Guide/OB/PEDS 217 - Peds Test 3 Study Guide. When is the fetal heart rate present? -postconceptual day 17 When are the four chambers of the heart and arteries developed? -gestational weeks 2 through 8 How does the fetus get oxygen during fetal development? -the placenta because the lungs do not perform oxygenation and ventilation In a fetus' heart, what allows blood to flow from the right to left atrium? - foramen ovale In a fetus' heart, what allows blood flow between the pulmonary artery and aorta, shunting blood away from the pulmonary circulation? - ductus arteriosus Why do the fetus' lungs not ventilate and oxygenate in utero? -they do not need their own O2 supply while in utero When should the foramen ovale close?