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Comparison between Lymph Vessels and Veins.

  • Similarities.
    • both have an interconnecting network of progressively larger vessels;
    • both transport fluids to the heart;
    • the larger lymph vessels have the same structure as veins, i.e. their walls have the same three layers;
    • both have semi-lunar valves to prevent any backward flow of blood;
    • the flow of fluid is slow but steady and at low pressure;
    • the fluid is deoxygenated;
    • like blood capillaries, the walls of lymph capillaries are composed of a single thin layer of squamous endothelium.
  • Differences.
    • the walls of lymph vessels are musch thinner and more transparent;
    • the muscle layer in lymph vessel is much less developed, but there is more connective tissue;
    • blood capillaries form a continuous, open circuit, whereas lymph capillaries end blindly in the tissues;
    • lymph capillaries have a larger diameter than blood capillaries;
    • lymph capillaries have walls which are more permeable than the walls of blood capillaries. Consequently, larger molecules (such as proteins) are able to diffuse through them.
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