Biology

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  • Blood flow
    1. Flows from the heart
    2. Through arteries
    3. Into capillaries
    4. Then into veins
    5. Back to the heart
  • Arteries
    • Thick walls with elastic tissue
    • Larger lumen than capillaries
    • High blood pressure
  • Capillaries
    • Single cell thick walls
    • Small lumen
    • Low blood pressure
    • Slow blood flow
  • Veins
    • Thin walls
    • Larger lumen than capillaries
    • Low blood pressure
    • Contain valves to prevent backflow
  • The heart pumps blood through the circulatory system