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Unit 2 -2

Fetal Circulation Figure

1 Placenta
2 Umbilical Vein
3 Ductus Venosus
6 Pulmonary Artery
7 Ductus Arteriosus
8 Foramen Ovale
9 Pulmonary Vein
10 To Brain and upper body
11 To the rest of the Body
12 Umbilical Arteries
13 Aorta
Ductus Venosus closes because ...... lack of blood flow when the cord is clamped
Foramen Ovale closes because....... due to change in pressure.
Ductus Arteriosus closes because ..... increased PO2 in baby, decreased prostaglandins, acetylcholine, bradykinin, catecholamines