Final answer:
The interatrial septum divides the right from the left atrium in the heart. It includes the fossa ovalis, which is the remnant of the foramen ovale. an opening in the fetal heart that allows blood to bypass the pulmonary (lung) circulation until the fetus starts breathing air after birth.
Step-by-step explanation:
The interatrial septum divides the right from the left atrium in the heart. It includes the fossa ovalis, which is an indentation that is the remnant of the foramen ovale, an opening in the fetal heart that allows blood to bypass the pulmonary (lung) circulation until the fetus starts breathing air after birth.
interatrial septum divides the right from the left atrium in the heart. It includes the fossa ovalis, which is the remnant of the foramen ovale. an opening in the fetal heart that allows blood to bypass the pulmonary (lung) circulation until the fetus starts breathing air after birth.