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loris [4]
3 years ago
10

A growing fetus has a vessel, the ductus arteriosus, in the heart that connects the pulmonary artery with the aorta and conducts

blood directly from the right ventricle to the aorta. Why do you think this vessel closes soon after birth?
Health
1 answer:
kirill115 [55]3 years ago
3 0

Answer:

The baby starts breathing

Explanation:

While in the womb, a fetus has its oxygen delivered to it, and the waste products removed (all via the mother's bloodstream), so there is no reason to separate all the chambers of the heart while still in the womb.

However, once the baby is born and it is breathing, the chambers need to differentiate in order to allow the blood to reach the lungs, and the oxygenated blood and deoxygenated blood do not mix.

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