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Cardiovascular

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Veins and Venules

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  • Topic Anchor: Veins & Venules
    • Blood vessels taking blood towards the heart
    • Structure: 
      • Less smooth muscle around veins
        • Large lumen, thinner walls
      • Inside lined with endothelial cells
      • Venules are small branches of veins leading from capillaries
    • Low pressure
      • Contain one-way valves to prevent backflow of blood
    • High volume 
      • Can stretch to hold far greater volume of blood