Question

which of the following is a change that occurs in fetal circulation at birth?
ductus venosus continues to carry blood to the liver
foramen ovale closes to become the fossa ovalis
ductus arteriosis opens
umbilical arteries become the fossa ovalis

Explanation:

• Option A: After birth, the ductus venosus closes, not continues to carry blood to the liver.
• Option B: At birth, with the establishment of pulmonary circulation and changes in blood pressure, the foramen ovale closes and becomes the fossa ovalis.
• Option C: The ductus arteriosus closes after birth, not opens.
• Option D: The umbilical arteries do not become the fossa ovalis. The fossa ovalis is the remnant of the foramen ovale.

Answer:

B. Foramen ovale closes to become the fossa ovalis