Gynaecology & Obstetrics All of these are responsible for preferential shunting of well oxygenated blood from fetal right atrium to left hea, EXCEPT? A Upper interatrial septum B Crista dividens C Pattern of blood flow in IVC D Size difference of left and right atrium 💡 Explanation All of these are responsible for preferential shunting of well oxygenated blood from fetal right atrium to left hea, EXCEPT? ✓ Correct Answer: D. Size difference of left and right atrium