The term 'Chamber of the Heart' refers to one of the four chambers of the heart, specifically the ventricle. The ventricle is a muscular chamber that pumps blood from the heart to the rest of the body. It is composed of two parts, the left and right ventricles, which are separated by a wall of muscle called the septum. The left ventricle pumps oxygenated blood to the body, while the right ventricle pumps deoxygenated blood to the lungs. The ventricle is an essential part of the cardiovascular system, as it is responsible for pumping blood throughout the body.