Questions: The Ductus Arteriosus connects the fetal to the aorta instead of to the fetal Umbilical vein ... liver Atria ... ventricles Heart ... vena cava Pulmonary trunk ... lungs

The Ductus Arteriosus connects the fetal to the aorta instead of to the fetal Umbilical vein ... liver Atria ... ventricles Heart ... vena cava Pulmonary trunk ... lungs
Transcript text: The Ductus Arteriosus connects the fetal $\qquad$ to the aorta instead of to the fetal $\qquad$ Umbilical vein ... liver Atria $\qquad$ ventricles Heart $\qquad$ vena cava Pulmonary trunk ... lungs
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Solution

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The answer is the fourth one: Pulmonary trunk ... lungs.

Explanation for each option:

  1. Umbilical vein ... liver: The umbilical vein carries oxygenated blood from the placenta to the fetus, but it does not connect directly to the ductus arteriosus. Instead, it connects to the liver and then to the inferior vena cava via the ductus venosus.

  2. Atria ... ventricles: The atria and ventricles are chambers of the heart, but the ductus arteriosus does not connect these structures. The ductus arteriosus is a vessel that bypasses the lungs, not a connection between heart chambers.

  3. Heart ... vena cava: The ductus arteriosus does not connect the heart directly to the vena cava. The vena cava is a major vein that returns deoxygenated blood to the heart, but it is not involved in the function of the ductus arteriosus.

  4. Pulmonary trunk ... lungs: The ductus arteriosus connects the pulmonary trunk to the aorta, allowing blood to bypass the non-functioning fetal lungs and flow directly into the systemic circulation. This is the correct answer.

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