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Circulation that are absent in the adult circulation

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1) The ductus arteriosus and the ductus venosus are two key vessels in the fetal circulation that are absent in the adult circulation. What are their function in the fetus? Why are they necessary?

2) At birth, the fetal circulation is transformed instantaneously into the adult circulation with practically no transition. How is this marvelous process possible?

Reference no: EM131342467

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