All of the following are changes that occur to the fetal circulation within minutes of birth EXCEPT for which?A Constriction of the umbilical vesselsB Constriction of the ductus venosusC Constriction of the ductus arteriosusD Constriction of the hepatic portal sinusE Closure of the foramen ovale
Question
All of the following are changes that occur to the fetal circulation within minutes of birth EXCEPT for which?A Constriction of the umbilical vesselsB Constriction of the ductus venosusC Constriction of the ductus arteriosusD Constriction of the hepatic portal sinusE Closure of the foramen ovale
Solution
The answer is D. Constriction of the hepatic portal sinus.
Here's why:
A. Constriction of the umbilical vessels: This happens immediately after birth when the umbilical cord is clamped and cut.
B. Constriction of the ductus venosus: This also happens soon after birth. The ductus venosus is a fetal blood vessel that connects the umbilical vein to the inferior vena cava. After birth, it constricts and eventually closes.
C. Constriction of the ductus arteriosus: This is a small vessel connecting the pulmonary artery to the descending aorta in a fetus. It constricts and closes soon after birth as the baby starts to breathe and oxygenate its own blood.
E. Closure of the foramen ovale: This is an opening in the fetal heart that allows blood to bypass the lungs. After birth, as the baby starts to breathe, the pressure changes in the heart and the foramen ovale closes.
D. Constriction of the hepatic portal sinus: This does not occur. The hepatic portal sinus is not a structure that undergoes changes at birth. It is a part of the adult circulation system, not the fetal circulation system.
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