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Why is the pulmonary circulation reduced in the human fetus?

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According to the American Heart Association, fetal circulation does not include pulmonary circulation because the fetus is unable to breathe oxygen in the womb. Instead, the mother's placenta oxygenates the blood for the fetus. read more

Pulmonary circulation reduced in the human fetus because the baby gets its oxygen from its mother & it does not breath on its own. read more

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