Left ventricle. Your heart has four chambers. Left and Right Atria, and Left and Right Ventricles. The side it's on refers to how it appears from the person's point of view. read more
The left ventricle is the largest and most muscular chamber of the heart. This makes sense since it has to pump blood the furthest. The right ventricle only has to pump blood to the two lungs via the pulmonary circuit. read more