character: Veins
topic: Role of Veins in Blood Return to the Heart
grade: 10
subject: Biology
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character: Heart
topic: Circulatory System Overview
grade: 10
subject: Biology
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character: Capillaries
topic: Diffusion and Blood Cell Exchange
grade: 10
subject: Biology
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character: Arteries
topic: Differences Between Arteries and Veins
grade: 10
subject: Biology
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