Chapter 20 CS continued

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  1. Define

    1) arteries
    2) veins
    3) capillaries
    1) Arteries carry blood away from the heart

    2) Veins carry blood towards the heart

    3) Capillaries connect veins and arteries to one another
  2. What are the 3 layers of vessel walls?
    • 1) Tunica interna
    • 2) Tunica media
    • 3) Tunica externa
  3. Tunica interna
    • - Selective permeable membrane
    • - Secretes chemicals to vasodilate or contrict
    • - It can help repel platelets from sticking together unless injured or inflammed
  4. Tunica media
    - Is the thickest
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9367
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Chapter 20 CS continued
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arteries veins and capillaries
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