What is the container of cardiovascular system?

The cardiovascular system is a system of blood vessels, including arteries, capillaries, and veins, which transport blood throughout the body. The container of the cardiovascular system is the heart, which is a muscular organ that pumps blood through the vessels. The heart is located in the center of the chest, slightly to the left. It is about the size of a clenched fist and weighs between 10 and 12 ounces. The heart has four chambers: two atria (upper chambers) and two ventricles (lower chambers). The atria receive blood from the body and the ventricles pump blood out to the body. The heart is enclosed in a protective sac called the pericardium.