Veins

• What do veins do?

  Take blood back to the heart under low pressure
• What do veins have?

  A wider lumen than equivalent arteries, with VERY LITTLE elastic or muscle tissue
• What do veins contain?

  Valves
• Why do veins contain valves?

  to stop the blood flowing backwards
• What is blood flow through the veins helped by?

  contraction of the body muscles surrounding them
• What do ALL VEINS carry?

  Deoxygenated blod
• Why do all veins carry deoxygenated blood?


  Because oxygen has been used up by body cells
• Which veins DO NOT carry deoxygenated blood?

  The pulmonary veins
• What do pulmonary veins carry?

  Oxygenated blood to the heart FROM THE LUNGS