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

Question

Quizplus · Accepted Answer

The allantois is an extraembryonic membrane that extends from the developing embryo and forms the basis for the urinary bladder and umbilical cord in mammals. The placenta is another extraembryonic membrane, but it serves a different function in providing nutrients and gas exchange between the mother and developing fetus. The amnion and chorion are also extraembryonic membranes, but they are involved in forming the amniotic sac and protecting the developing embryo/fetus, respectively. The yolk sac plays a role in early embryonic development, but not in the formation of the urinary bladder.

The Extraembryonic Membrane That Forms the Urinary Bladder Is the