The left side of the heart collects oxygen-rich blood from the lungs and pumps it to the body. The left and right sides of the heart are divided by walls<span> called septums. There is an atrial septum that separates the right and left atriums, and a ventricular septum that separates the right and left ventricles.</span>
<span>The left and the right sides of the heart are separated by walls of tissue known as septums. There are two septums in the heart. The atrial septum separates the left and the right atria, and the ventricular septum separates the left ventricles from the right ventricles. </span>
