Bloodvessels

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  • Bloodvessels

    1. 1. Animal Transport Systems <ul><li>Blood Vessels </li></ul>
    2. 2. Blood Vessels <ul><li>There are three main types of blood vessels </li></ul><ul><li>i/ Arteries </li></ul><ul><li>ii/ Veins </li></ul><ul><li>iii/ Capillaries </li></ul>
    3. 3. ARTERIES
    4. 4. ARTERIES ARTERIOLES
    5. 5. ARTERIES ARTERIOLES CAPILLARIES
    6. 6. ARTERIES ARTERIOLES CAPILLARIES VENULES
    7. 7. ARTERIES ARTERIOLES CAPILLARIES VENULES VEINS
    8. 8. Blood Vessels <ul><li>ARTERIES </li></ul><ul><li>Carry blood away from the heart </li></ul><ul><li>Thick muscular walls </li></ul><ul><li>Lots of elastic tissue in wall </li></ul><ul><li>Relatively small lumen </li></ul><ul><li>Blood under high pressure </li></ul><ul><li>Blood flow rapid </li></ul><ul><li>Blood flows in pulses </li></ul><ul><li>No valves </li></ul>
    9. 9. ARTERIES
    10. 10. ARTERIES artery outer layer
    11. 11. ARTERIES artery outer layer thick smooth muscle
    12. 12. ARTERIES artery outer layer thick smooth muscle elastic white fibrous tissue
    13. 13. ARTERIES artery outer layer thick smooth muscle elastic white fibrous tissue inner lining (endothelium)
    14. 14. Arteries <ul><li>The elastic tissue in the artery wall allows the vessel to ‘give’ as blood surges through. </li></ul><ul><li>So, the artery wall first stretches as a result of the high blood pressure, </li></ul><ul><li>before an elastic recoil of the wall pushes the blood on its way. </li></ul><ul><li>This swelling can be felt as a pulse where arteries travel near the skin surface. </li></ul>
    15. 16. Blood Vessels <ul><li>VEINS </li></ul><ul><li>Carry blood back to the heart </li></ul><ul><li>Thin muscular walls </li></ul><ul><li>Little elastic tissue in the wall </li></ul><ul><li>Relatively large lumen </li></ul><ul><li>Blood under low pressure </li></ul><ul><li>Blood flow is slow </li></ul><ul><li>No pulse </li></ul><ul><li>Valves prevent backflow of blood </li></ul>
    16. 17. Vein
    17. 18. Vein outer layer
    18. 19. Vein outer layer thin smooth muscle
    19. 20. Vein outer layer thin smooth muscle inner lining (endothelium)
    20. 21. Vein outer layer thin smooth muscle inner lining (endothelium) valve
    21. 22. VEINS <ul><li>How the semi-lunar valve works in a vein: </li></ul><ul><li>The blood has just enough pressure to force the valve open as it flows towards the heart </li></ul><ul><li>Backflow of blood causes the valves to close </li></ul>
    22. 23. Blood Vessels <ul><li>CAPILLARIES </li></ul><ul><li>Link up arteries and veins in the tissues </li></ul><ul><li>No muscle </li></ul><ul><li>Wall made up of one cell thick endothelium </li></ul><ul><li>Small lumen – just large enough for a red blood cell to squeeze through </li></ul><ul><li>Pressure falls as blood passes along capillary </li></ul><ul><li>Blood flowing is slowing down </li></ul><ul><li>No pulse </li></ul><ul><li>No valves </li></ul>

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