The foramen ovale closes after birth because of:
a. Increased pressure in the left atrium
b. High oxygen content of the blood
c. Constriction of umbilical vessels
d. Decreased pressure in the right ventricle
ANS: A
The increase in pulmonary blood flow after birth causes the pressure in the left atrium to exceed that of the right atrium. This functionally closes the foramen ovale. Permanent closure occurs as adhesions develop.
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