Fetal Circulation Quiz

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  • 1/10 Questions

    Fetal blood is oxygenated by: 

    • Fetal lungs
    • Fetal liver
    • Placental
    • Inferior vena cava
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About This Quiz

Play this quiz to review the fetal blood circulation system and test your knowledge regarding the same. Basically, fetal circulation is the blood circulatory system of a fetus and is quite different from adult circulation. If you think you know enough about it and can easily pass this test below, try out the quiz then. The students who are preparing for competitive medical exams can also evaluate their knowledge with this questionnarie. All the best, buddy!

Fetal Circulation Quiz - Quiz

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  • 2. 

    The lungs are non-functional and can be ___________ in a fetus.

    • Bypassed

    • Utilized

    • Inflated

    • Destroyed

    Correct Answer
    A. Bypassed
    Explanation
    During fetal development, the lungs are non-functional because the fetus receives oxygen from the mother's blood through the placenta. Therefore, the lungs can be bypassed, meaning that they are not actively involved in the process of respiration. Instead, the blood is directed away from the lungs through a temporary blood vessel called the ductus arteriosus, which connects the pulmonary artery to the aorta. This allows the oxygen-rich blood to circulate directly to the vital organs of the fetus, bypassing the non-functional lungs.

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  • 3. 

    What events happen during transitional circulation?

    • The foramen ovale shunt closes

    • The ductus arteriosus shunt closes

    • The ductus venous shunt closes

    • Gas exchange shifts from the placenta to the lungs

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    During transitional circulation, several events occur. Firstly, the foramen ovale shunt closes, which is a hole between the left and right atria in the fetal heart. Secondly, the ductus arteriosus shunt closes, which is a blood vessel connecting the pulmonary artery to the aorta in the fetal heart. Thirdly, the ductus venous shunt closes, which is a blood vessel connecting the umbilical vein to the inferior vena cava in the fetal heart. Lastly, gas exchange shifts from the placenta to the lungs, as the baby begins to breathe independently. Therefore, the correct answer is "all of the above".

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  • 4. 

    Following circulation, deoxygenated fetal blood returns to the placenta via the:

    • Umbilical arteries

    • Umbilical veins

    • Spinal arteries

    • Uterine veins

    Correct Answer
    A. Umbilical arteries
    Explanation
    The umbilical arteries carry deoxygenated blood from the fetus to the placenta. This blood is rich in waste products and carbon dioxide, which need to be removed. The placenta acts as a filter, allowing the exchange of nutrients, oxygen, and waste products between the mother and the fetus. Once the blood is oxygenated and waste products are removed in the placenta, it returns to the fetus through the umbilical veins.

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  • 5. 

    The structure that diverts oxygenated blood from the right atrium to the left atrium:

    • Foramen ovale

    • Ductus arteriosus

    • Ductus venous

    • Pulmonary trunk

    Correct Answer
    A. Foramen ovale
    Explanation
    The foramen ovale is a small opening between the right and left atria of the fetal heart. During fetal development, it allows oxygenated blood to bypass the non-functioning lungs and flow directly from the right atrium to the left atrium. This is important because the lungs are not yet fully developed and cannot efficiently oxygenate blood. After birth, the foramen ovale typically closes as a flap of tissue seals the opening, redirecting blood flow to the lungs for oxygenation.

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  • 6. 

    Fetal circulation is uniquely designed to:

    • Direct most of the oxygenated blood to the arterial system

    • Avoid blood flow to nonfunctional fetal lungs

    • Divert half of oxygenated blood away from the liver

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Fetal circulation is designed to direct most of the oxygenated blood to the arterial system, as the body requires oxygen for growth and development. It also avoids blood flow to the nonfunctional fetal lungs since oxygen exchange occurs through the placenta. Additionally, fetal circulation diverts half of the oxygenated blood away from the liver to ensure that a sufficient amount reaches other organs and tissues. Therefore, all of the given options accurately describe the unique design of fetal circulation.

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  • 7. 

    The structure that diverts half of the oxygenated blood from the umbilical vein into the inferior vena cava is the:

    • Foramen ovale

    • Ductus arteriosus

    • Ductus venosus

    • Pulmonary trunk

    Correct Answer
    A. Ductus venosus
    Explanation
    The structure that diverts half of the oxygenated blood from the umbilical vein into the inferior vena cava is the ductus venosus. During fetal development, the ductus venosus allows oxygenated blood from the placenta to bypass the liver and flow directly into the systemic circulation. This helps ensure that sufficient oxygenated blood reaches the developing fetus. After birth, the ductus venosus closes and becomes a ligament known as the ligamentum venosum.

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  • 8. 

    The structure that diverts oxygenated blood from the pulmonary trunk to the fetal aorta:

    • Foramen ovale

    • Ductus ateriosus

    • Ductus venous

    • Pulmonary trunk

    Correct Answer
    A. Ductus ateriosus
    Explanation
    The correct answer is ductus ateriosus. During fetal development, the ductus ateriosus is a blood vessel that connects the pulmonary trunk to the aorta, bypassing the lungs. This allows oxygenated blood to be directed away from the non-functioning fetal lungs and towards the rest of the body. After birth, the ductus ateriosus normally closes, redirecting blood flow to the lungs for oxygenation.

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  • 9. 

    Which of the following is NOT true about postnatal development of the heart?

    • The right ventricular myocardium thins

    • There is a reduction in pulmonary vascular resistance

    • The left ventricular myocardium thickens

    • There is an increase in systemic circulation

    • The position of the heart shifts higher

    Correct Answer
    A. The position of the heart shifts higher
    Explanation
    During postnatal development of the heart, various changes occur. The right ventricular myocardium thins, the left ventricular myocardium thickens, and there is a reduction in pulmonary vascular resistance. Additionally, there is an increase in systemic circulation. However, it is not true that the position of the heart shifts higher during postnatal development.

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  • 10. 

    The right ventricle pumps what type of blood up through the pulmonary artery?

    • Oxygenated

    • Deoxygenated

    • Mixed

    • None of the above

    Correct Answer
    A. Mixed
    Explanation
    The right ventricle pumps mixed blood up through the pulmonary artery. This is because the right ventricle receives deoxygenated blood from the body and pumps it to the lungs to be oxygenated. However, it also receives a small amount of oxygenated blood from the left ventricle through the coronary arteries. Therefore, the blood pumped by the right ventricle is a mixture of both oxygenated and deoxygenated blood.

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Quiz Review Timeline (Updated): Mar 22, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 11, 2022
    Quiz Created by
    Alfredhook3
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