The circulatory system is made up of the heart, the blood and blood vessels. The location of the circulatory system is the location of all these three components.
The heart is a unique muscular component of the circulatory system. The circulation of the blood can be said to begin here and is kept going because of the heart beating. The circulation is a continuous loop and is said to be of the closed type. The heart is roughly the size of your closed fist. It is located in the thorax region with its apex to the left. It lies in between both the right and the left lungs. It rests on the diaphragm. It lies beneath the second rib.
The blood is contained within the blood vessels and the heart. The volume of blood is around 4.7 to 5 liters in an average adult.
The blood vessels lie throughout the body. In fact, the arteries and veins are named after the various organs to which they supply or receive blood, and some even after their location in the body. For example, the coronary arteries and veins pertain to their location in the heart. Renal arteries and veins are for the kidneys.
Also, the veins lie closer to the surface of the skin than arteries. This is why veins can be easily detected.
Sometimes, the lymph and its lymph vessels are also considered to be part of the circulatory system by some scientists. The lymph ducts are present wherever there are blood vessels.
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