In the primitive cardiovascular system, which vessels return blood from the yolk sac?

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Multiple Choice

In the primitive cardiovascular system, which vessels return blood from the yolk sac?

Blood from the yolk sac returns to the primitive heart through the vitelline veins. These vessels connect the yolk sac with the sinus venosus of the developing heart and play a key role in bringing yolk sac blood into the circulation (they later contribute to the hepatic portal system and hepatic veins). In contrast, the umbilical veins carry placental blood to the embryo, while the cardinal veins drain the embryo’s body and the coronary veins drain the myocardium. So the vitelline veins are responsible for returning yolk sac blood.

Blood from the yolk sac returns to the primitive heart through the vitelline veins. These vessels connect the yolk sac with the sinus venosus of the developing heart and play a key role in bringing yolk sac blood into the circulation (they later contribute to the hepatic portal system and hepatic veins). In contrast, the umbilical veins carry placental blood to the embryo, while the cardinal veins drain the embryo’s body and the coronary veins drain the myocardium. So the vitelline veins are responsible for returning yolk sac blood.

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