Cardiac structure and vascular system

This article discusses the heart, its structure, physiology, function, and the blood vessels associated with the heart, which are of great importance for human life. There is an ear-shaped structure in the upper right atrium called the right atrial appendage, or auricle, and another in the upper left atrium, the left a trial appendage. The right atrium and the right ventricle together are sometimes referred to as the right heart. These contractile cells are connected by intercalated discs which allow a rapid response to impulses of action potential from the pacemaker cells. The intercalated discs allow the cells to act as a syncytium and enable the contractions that pump blood through the heart and into the major arteries.