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The circulatory system is the body's main transport network for fluids. Made up of the heart, blood vessels, and blood, it moves plasma and cells throughout the body, delivering nutrients and oxygen to tissues while carrying away wastes. It also helps maintain fluid balance and blood volume; interstitial fluid moves between tissues and is returned to the bloodstream, with the lymphatic system assisting that return. While other systems influence fluid dynamics (nervous for regulation, digestive for nutrient handling, endocrine for hormone distribution), the circulatory system is the primary means by which body fluids are transported and distributed.