The Extraembryonic Membrane That Forms the Urinary Bladder is The

Question

The extraembryonic membrane that forms the urinary bladder is the
A)placenta.
B)allantois.
C)amnion.
D)chorion.
E)yolk sac.

Accepted Answer

The allantois is an extraembryonic membrane that functions in waste storage and nutrient transport. In some animals, such as birds, it contributes to gas exchange. In humans, it forms the urinary bladder. The placenta is an organ that provides nutrients and oxygen to the developing fetus and removes waste. The amnion is a fluid-filled sac that surrounds and protects the developing embryo/fetus. The chorion is another extraembryonic membrane that contributes to the formation of the placenta. The yolk sac is an extraembryonic membrane that contributes to the formation of the digestive tract and blood cells.