blood vessels, heart and blood Your circulatory system is made up of several parts, including your: Heart: This muscular organ works to pump blood throughout your body via an intricate network of blood vessels. Arteries. These thick-walled blood vessels carry oxygenated blood away from your heart. Veins: These blood vessels carry deoxygenated blood back toward your heart. Capillaries: These tiny blood vessels facilitate the exchange of oxygen, nutrients, and waste between your circulatory system and your organs and tissues.

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