character: Mr. Liu
topic: Blood Flow and the Circulatory Pathways
grade: 11
subject: Science
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character: Mr. Liu
topic: The Role of the Heart in Circulation
grade: 11
subject: Science
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character: Mr. Liu
topic: Understanding Blood Vessels: Arteries, Veins, and Capillaries
grade: 11
subject: Science
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character: Mr. Liu
topic: The Importance of Oxygen and Nutrient Transport in the Body
grade: 11
subject: Science
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