This document provides an overview of the structure and function of the human heart. It describes the main parts of the heart including the atria, ventricles, septum, and valves. It explains how blood circulates through the heart, entering the right atrium and exiting through the pulmonary artery to the lungs before returning to the left atrium. It also discusses heart rate, maintaining a healthy heart through exercise and diet, and includes diagrams of the heart.