Circulatory System

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Focusing on the circulatory system's structure, it consists of five main components: the heart, lungs, and capillaries, forming a closed system where blood remains contained. The arterial system, comprising arteries and arterioles, is responsible for transporting oxygen-rich blood from the heart to the lungs, while the venous system, made up of veins and venules, returns deoxygenated blood back to the heart. This intricate system plays a crucial role in maintaining efficient blood circulation.