The foramen ovale is covered by a flap that creates a check valve allowing blood to flow unidirectionally from the _____ to the _____.
A)right atrium; right ventricle
B)right ventricle; left ventricle
C)right atrium; left atrium
D)left atrium; left ventricle

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 (atrium)-to-left (atrium) shunting necessary for fetal circulation.

The Foramen Ovale Is Covered by a Flap That Creates