<P> Some of the blood entering the right atrium does not pass directly to the left atrium through the foramen ovale , but enters the right ventricle and is pumped into the pulmonary artery . In the fetus , there is a special connection between the pulmonary artery and the aorta , called the ductus arteriosus , which directs most of this blood away from the lungs ( which are not being used for respiration at this point as the fetus is suspended in amniotic fluid ) . </P>
<P> Some of the blood entering the right atrium does not pass directly to the left atrium through the foramen ovale , but enters the right ventricle and is pumped into the pulmonary artery . In the fetus , there is a special connection between the pulmonary artery and the aorta , called the ductus arteriosus , which directs most of this blood away from the lungs ( which are not being used for respiration at this point as the fetus is suspended in amniotic fluid ) . </P>
what connects the pulmonary trunk to the aorta during fetal circulation
what connects the pulmonary trunk to the aorta during fetal circulation
ductus arteriosus
ductus arteriosus