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.

Question

Quizplus · Accepted Answer

The fossa ovalis is the remnant of the foramen ovale, which closes to prevent mixing of blood between the atria. The ligamentum arteriosum is the remnant of the ductus arteriosus, which closes to prevent mixing between the aorta and pulmonary artery.

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