Question

Blood flowing through umbilical cord is

• A. 100% foetal
• B. 100% maternal
• C. 50% foetal, 50% maternal
• D. 90% foetal, 10% maternal

Answer 1

The correct option is A

100% foetal

The correct option is A.

Explanation of correct option-

1. Umbilical cord is the birth cord which is present between placenta and the foetus.
2. The umbilical cord enters the abdomen of the fetus and the umbilical veins move toward the fissure of the liver then it splits into two and one of the veins join the hepatic system and the second joins the inferior vena cava which carries blood toward the heart.
3. It is developed from the allantois and it contains some yolk sac.
4. It is not directly linked to the mother but they are attached to the placenta.
5. Placenta transfers materials from mother to embryo and from embryo to mother.
6. The blood present in the umbilical cord is completely foetal blood.
7. There is no mixing of mother blood.

Final answer: Blood flowing through the umbilical cord is 100% foetal