Final answer:
The moderator band is a band of cardiac muscle that reinforces the thin walls of the right ventricle and plays a crucial role in cardiac conduction.
Step-by-step explanation:
The moderator band is a band of cardiac muscle covered by endocardium that reinforces the thin walls of the right ventricle and plays a crucial role in cardiac conduction. It arises from the inferior portion of the interventricular septum and crosses the interior space of the right ventricle to connect with the inferior papillary muscle. It contains conductile fibers that carry electrical signals followed by contraction of the heart.