# data[].attributes.body
Science is fun

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Valves that prevent backflow

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Under high pressure

oxygen-rich blood

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High pressure

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Thick wall narrow opening

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Thick wall large opening

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Carries blood under low pressure

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Thin wall one cell thick

# data[].attributes.body
Thin wall, large opening

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No valves

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Toward ♥♥

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No valves

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Connects arteries to veins

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Under low pressure

O2-poor blood

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Brings blood away from the heart