The interventricular septum divides the left ventricle from the right ventricle, thus keeping oxygenated blood from mixing with deoxygenated blood. Without this separation, the body would not be able to obtain the level of oxygen it needs for subsistence. The septum also contributes to the heart's shape and structure.
Within the heart, the ventricles are responsible for supplying the body with oxygen-rich blood. The larger left ventricle pumps blood to most of the body, while the right ventricle sends blood to the lungs. If oxygenated blood from the left ventricle were to mix with deoxygenated blood from the right ventricle, the integrity and efficacy of the system would be disrupted, preventing the body from receiving an ample oxygen supply.
The septum fulfills the role of keeping the two ventricles separate. It is primarily made out of thick muscle. It is slanted backwards and to the right. Its right curve forms a portion of the chamber of the right ventricle.
The upper part of the septum separates the aortic vestibule from the right atrium. This portion has a highly fibrous structure.
Ventricular septum defect is a disorder characterized by a hole in the septum. It most commonly occurs in newborn infants.