Asked by Chuck Bass
Which of the following statements is true about veins?
Pulmonary veins deliver deoxygenated blood to the lungs.
Veins carry oxygenated blood.
Veins contain valves that permit blood to flow in only one direction.
None of these are true.
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"Veins contain valves that permit blood to flow in only one direction." — True.
Most veins (especially in the limbs) have one-way valves to prevent backflow and help return blood to the heart. The other statements are false: pulmonary veins carry oxygenated blood from the lungs to the heart, and generally veins (except pulmonary and fetal umbilical vein) carry deoxygenated blood.
Most veins (especially in the limbs) have one-way valves to prevent backflow and help return blood to the heart. The other statements are false: pulmonary veins carry oxygenated blood from the lungs to the heart, and generally veins (except pulmonary and fetal umbilical vein) carry deoxygenated blood.
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