Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The human heart is a muscular organ with the task of providing a continuous blood circulation through the cardiac cycle. It is one of the most vital organs in the human body and is divided into four main chambers, namely the left and right Atrium – the two upper chambers – and the right and left Ventricle – two lower chambers. The heart has a thick wall of muscle separating its right side and its left side called the septum. With each beat, the right ventricle pumps the same amount of blood into the lungs that the left ventricle pumps out into the body. Physicians usually refer to the right atrium and right ventricle together as the right heart and to the left atrium and ventricle as the left heart...You can learn more about the human heart and disease associated to it with the help of this book.