The Function of the Yolk Sac is To

Question

The function of the yolk sac is to
A) provide food until the blastocyst implants in the uterus
B) develop into a protective structure called the "bag of waters"
C) help in the production of blood cells
D) All of the above are functions of the yolk sac.

Accepted Answer

The yolk sac helps in the production of blood cells in the early stages of embryonic development, before the fetal liver takes over this function. It does not provide food or develop into the "bag of waters".