The nurse caring for newborns with congenital heart defects knows that these defects occur when certain events do not take place after birth. Which of the following describes one of these events?
A) The foramen ovale opens.
B) The ductus arteriosus expands.
C) The ductus venosus becomes a ligament.
D) The lungs retract.
C
Feedback:
Normally, with the newborn's first few respirations, the lungs expand as soon as the pressure within the chest alters. The foramen ovale closes, and the ductus arteriosus and ductus venosus shrivel and become fibrous ligaments. Congenital heart defects in a child occur when these events do not take place after birth.
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