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The human circulatory system, or blood system, is responsible for transporting blood throughout the body. It's like a highway network for our body. The major components include: Heart: The heart is the engine, pumping blood through the blood vessels. Blood vessels: These are like the roads. Arteries carry oxygen-rich blood away from the heart, veins bring oxygen-depleted blood back, and capillaries connect them, allowing for exchange of oxygen and nutrients. Blood: This is the traffic, carrying oxygen, nutrients, hormones, and waste products to and from the body's cells.