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1.Blood volume: immediately after birth averages about 300ml. (75mL additional blood from umbilical cord â if itâs still attached) But the fluid is lost into the neonateâs tissue spaces again - 300mL maintained. 2.Cardiac Output: in average 500ml/min.
Quiz 30. With birth, a change from parallel flow through the heart to a serial one gradually takes place. The following changes must occur: The gas exchange takes place in the baby's lungs. By cutting the umbilical cord, the placental circulation system is switched off. The fetal heart shunts become closed.