In the Fetal Heart,several Structures Allow Blood from the Left

Multiple Choice

In the fetal heart,several structures allow blood from the left and right sides to mix.When the newborn takes its first breath,these structures must close to ensure that oxygenated blood from the left side does not mix with deoxygenated blood from the right side.Which of the following closed structures prevent this mixing between the systemic and pulmonary circulation after the umbilical cord is cut? Select all that apply.

A) fossa ovalis
B) ligamentum arteriosum
C) ligamentum venosum
D) ligamentum teres