Question

multiple choice question
what is the interatrial septum?
the wall that separates the atria from the ventricles
the wall that separates the heart from the pericardial cavity
the wall that separates the right and left atria
the wall that separates the right and left ventricles

Explanation:

The interatrial septum is the wall within the heart that divides the two upper - chambers (atria). It separates the right atrium from the left atrium.

Answer:

The wall that separates the right and left atria