When the fetus makes the transition to becoming a newborn and extrauterine life begins, there occurs a series of changes, including decreased pulmonary vascular resistance, increased pulmonary blood flow, increased pressure of the left atrium,
decreased pressure of the right atrium, and closure of which of the following structures? a. foramen ovale c. inferior vena cava
b. ductus venosus d. superior vena cava
A
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A Correct. The transition to extrauterine life requires the lungs to initiate respirations and the PaO2 levels increase. The opening between the left and right atria, the foramen ovale, closes shortly after birth.
B Incorrect. The ductus venosus closes more gradually, usually within 2 weeks of birth.
C Incorrect. The inferior vena cava must remain open for life to persist.
D Incorrect. The superior vena cava must remain open for life to persist.
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