In fetal development, the _________ is open to allow blood to flow in the heart
1. Patent ductus arteriosus
2. Pulmonic valve
3. Aortic valve
4. Bicuspid valve
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1. The patient ductus arteriosus is the opening in the heart that allows blood to flow in the heart.
2. The pulmonic valve is not the opening.
3. The aortic valve is open before and after birth.
4. The bicuspid valve is open before and after birth.
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