The function of a patent opening between the left and right atria in a fetus is that it allows:
A)right-to-left blood shunting.
B)left-to-right blood shunting.
C)blood to flow from the umbilical cord.
D)blood to flow to the lungs.

Question

Quizplus · Accepted Answer

The nonfused septum secundum and ostium secundum result in the formation of a flapped orifice known as the foramen ovale, which allows the right-to-left shunting necessary for fetal circulation.

The Function of a Patent Opening Between the Left and Right