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When a child is born, what happens to its blood circulation ?
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- Its blood flows for the first time
- Its blood reverses its flow through the heart
- Its blood ceases to pass from one atrium to the other
- Its blood carries wastes for the first time
Correct Option: D
The Fetal circulatory system is unique during pregnancy before the lungs first come into use at birth. Its circulatory system must reorient itself to send all the blood through the lungs to receive oxygen. The baby is cut off from the placenta, which was previously its only source of nourishment. The blood vessels that ran through the umbilical cord constrict and close. All this happens in a few moments when the baby is born.
