growth and early development 1. As oxygen is lost from the pulmonary circulation
ID: 2077759 • Letter: G
Question
growth and early development
1. As oxygen is lost from the pulmonary circulation into the lung fluid in the non-operational foetal lungs resulting in a high resistance, low flow environment, diversion of blood away from the pulmonary circuit is imperative and achieved by:
a.The foramen ovale
b.The ductus arteriosus
c.Both A & B are correct
d.Neither A or B are correct
Why?
2. With respect to the primitive embryological circulation at week 4, the vessel responsible for carrying blood from the yolk sac to the heart is the:
a.Umbilical artery
b.Vitelline vein
c.Vitelline artery
d.Sinus venosus
Why?
3. With respect to the primitive embryological circulation at week 4, the vessel responsible for carrying blood from the embryo proper to the heart is the:
a.Cardinal vein
b.Umbilical vein
c.Inferior vena cava
d.Vitelline vein
Why?
4. The ductus arteriosus shunts blood from:
a.The left atria to the right atria
b.The umbilical vein to the umbilical artery
c.The umbilical vein to the inferior vena cava
d.The pulmonary artery to the aorta
Why?
5. In the foetal circulation, the blood that contains the MOST oxygen content can be found in the:
a.Pulmonary artery
b.Pulmonary vein
c.Inferior Vena Cava
d.Umbilical Vein
Why?
6. In the foetal circulation, the blood that contains the LEAST oxygen content can be found in the:
a.Ductus venosus
b.Pulmonary arteries
c.Iliac veins
d.Inferior Vena Cava
Why?
7. In the foetal heart, which chamber works the hardest and therefore has the thickest wall?
a.The left atria
b.The left ventricle
c.The right ventricle
d.Both B & C are correct
Why?
8. Which of the following statements is TRUE of the placental circulation?
a.The placental circulation is a low resistance, high blood flow system.
b.The placental circulation is a high resistance, low blood flow system.
c.Blood is directed into the placental circulation by the umbilical vein.
d.Blood is directed out of the placental circulation by the ductus arteriosus.
Why?
9. In the placental circulation, increased surface area for the adequate exchange of gases, nutrients and wastes is achieved via:
a.The spiral arteries
b.The myometrium
c.The chorionic villi
d.The umbilical arteries
Why?
10. Ductus venosus shunting:
a.Regulates the volume of blood returning to the foetal heart
b.Directs blood away from the hepatic portal system
c.A & B are both correct
d.Neither A or B are correct
Why?
Explanation / Answer
1)As oxygen is lost from the pulmonary circulation into the lung fluid in the non-operational foetal lungs resulting in a high resistance, low flow environment, diversion of blood away from the pulmonary circuit is imperative and achieved by The ductus arteriosus
2) With respect to the primitive embryological circulation at week 4, the vessel responsible for carrying blood from the yolk sac to the heart is the Vitelline vein
3) With respect to the primitive embryological circulation at week 4, the vessel responsible for carrying blood from the embryo proper to the heart is the Umbilical vein
4)The ductus arteriosus shunts blood from The pulmonary artery to the aorta
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