What causes closure of the foramen ovale at birth?

A. A rise in fetal oxygen levels, which triggers growth of the epithelial lining
B. Rapid myocardial tissue growth stimulated by pregnancy hormones
C. Higher pressure in the left atrium, which causes interatrial septum flaps to close
D. Migration of connective tissue from the right atrioventricular valve
E. An increase in endothelial mucous production, which forms a plug


Answer: C

Anatomy & Physiology

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