Veins carry blood back to the heart from the body. While arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood. Like the heart, veins contain valves to prevent blood backflow.
Veins __________ blood at __________ pressure.
oxygenated, low |
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oxygenated, high |
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deoxygenated, high |
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deoxygenated, low |