Fetal Circulation After Birth

what two key changes occur after birth

the placenta is removed and the lungs take in aie

how is the placenta disconnected

the whartons jelly contracts due to temp change and the umbilical chord is clamped increasing resistance

how do the lungs take in air

air pushes fluid out of the lungs increasing oxygen conc and decreasing resistance

how do the umbilical vein and ductus venousus close

blood is no longer supplied to them by the placenta

what causes the foramen ovale to close

pressure differences in the atria causes by low resistance in the lungs

what causes the ductus venousus to close

its muscle contracts as it detects low prostaglandins and high pressure in the LV

what causes the umbilical artery to constrict

high resistance in the placenta and low prostaglandins

what causes low prostaglandins

the placenta is no longer releasing it