Papillary muscles of the right ventricle receive a signal to contract from (the)

Question

Quizplus · Accepted Answer

The moderator band, also known as the septomarginal trabecula, is a muscular band that runs along the lower part of the right ventricle. It contains specialized cardiac muscle fibers that transmit electrical signals to the papillary muscles, causing them to contract and contribute to the opening and closing of the right atrioventricular valve (tricuspid valve). The bundle branches, AV node, and Purkinje fibers are involved in the electrical conduction of the heart, but they do not directly signal the contraction of the papillary muscles. Therefore, the correct answer is B) moderator band.

Papillary Muscles of the Right Ventricle Receive a Signal to Contract