The allantois functions
A) to destroy old blood cells.
B) to give rise to the yolk sac.
C) to form blood cells and become the umbilical blood vessels.
D) as a waste depository.
E) all of the above

Question

Quizplus · Accepted Answer

The allantois functions to form blood cells and become the umbilical blood vessels, which transport nutrients and oxygen from the placenta to the developing embryo. It does not function to destroy old blood cells, give rise to the yolk sac, or serve as a waste depository.

The Allantois Functions