Question

multiple choice question the wall that separates the upper chambers of the heart is the _____, and the wall that separates the lower chambers is the _____. endocardium; pericardium interatrial septum; interventricular septum chordae tendinae; papillary muscles

Explanation:

The interatrial septum separates the two upper chambers (atria) of the heart, and the interventricular septum separates the two lower chambers (ventricles). The endocardium is the inner - lining of the heart, the pericardium is the sac around the heart, chordae tendineae and papillary muscles are related to the heart valves.

Answer:

B. interatrial septum; interventricular septum