Question

the lower chambers of the heart are called the
multiple choice
ventricles.
aorta.
atria.
septum.

Explanation:

The heart has four chambers. The upper two are atria and the lower two are ventricles. The aorta is a large - artery, not a chamber. The septum is the wall that divides the heart chambers, not a chamber itself.

Answer:

A. ventricles