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The Circulatory System is a complex network of vessels and organs which transports essential nutrients and oxygen to all the cells of the body, while also carrying away waste products of metabolism It is composed of the pulmonary circulation, which moves blood to and from the lungs, and the systemic circulation which moves blood to and from the rest of the body. The circulatory system is controlled by the heart, and its muscular walls push blood away from the heart and into the arteries, which divide into smaller vessels and ultimately capillaries. The circulatory system is both vital for the functioning of the body, as well as a fascinating part of our anatomy. Here are five of the most interesting examples of the circulatory system. 1. Heart: The heart is a pump located in the center of the thorax, and it is the primary organ in the circulatory system. Its muscular walls contract and relax rhythmically, pushing blood to and from the lungs and the body. The heart is made up of four chambers, the left and right atria, and the left and right ventricles. It also has valves which prevent the backflow of the blood. 2. Arteries and Veins: The arteries are vessels that transport oxygenated blood away from the heart to the rest of the body. The veins, on the other hand, transport deoxygenated blood from the body back to the heart. Arteries have thicker walls than veins and are responsible for distributing oxygenated blood to all organs. Veins, on the other hand, are responsible for transporting wastes to the kidneys, and then the heart. 3. Capillaries: These are small vessels located in the body’s tissues that connect the arterioles and venules. They are responsible for the exchange of substances between the tissues and the blood. The walls are only one cell thick, allowing an efficient exchange of nutrients, oxygen and carbon dioxide. 4. Lymphatic System: The lymphatic system is an interconnected network of vessels and organs that helps transport lymphatic fluid made up of white blood cells, fatty acids and proteins. It is responsible for draining the extra fluid from tissues and returning it to the blood and for filtering out foreign materials. 5. Aorta: The aorta is the largest artery in human body, and allows oxygenated blood to move from the heart to the systemic circulation. It is composed of three layers of tissues and has a special set of muscles, which contract and relax when pumping blood. It branches off into several other arteries, which supply oxygenated blood to the head, neck, arms and legs. The circulatory system is a complex network of vessels and organs, and these five examples help to illustrate how fascinating and intricate it really is. Its various components play an important role in sustaining life, and without it, the body would not be able to survive.