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The circulatory system is a network of organs and vessels, including the heart, blood, and blood vessels, responsible for transporting oxygen, nutrients, hormones, and waste products throughout the body. Articles are a unique way for readers to learn about the world around them. In addition to building reading comprehension skills and increasing vocabulary, articles can be used for writing and research. Circulatory System is broken into 6 single-page sections: What is the Circulatory System?, The Heart, Blood and Blood Vessels, Taking Care of Your Circulatory System, Fun Facts, and Words to Know.