Blood Vessels

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Author:
leti5637
ID:
152830
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Blood Vessels
Updated:
2012-05-20 16:33:47
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Description:
Unit 4 Blood vessels
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  1. Blood Vessels
    A CLOSED SYSTEMS of roadways used for transport
  2. Pulmonary Circuit
    Less than 9% blood

    Oxygenation of BLOOD

    • Path:
    • Right ventricles -->
    • Lungs -->
    • Left Atrium
  3. Systemic Circuit
    About 84% of blood

    • Oxygenation of TISSUE
    • Left Ventricle -->
    • Body -->
    • Right Atrium
  4. Layers of vessel wall
    Outwards ---> in
    • Tunica Externa
    • Tunica Media
    • Tunica Intima
  5. Tunica Intima (Interna)
    Deepest layer (contact w blood)

    Endothelial layer + Basal Lamina

    ARTERIES have ElASTIC MEMBRANE
  6. Tunica Media
    Middle layer

    Smooth Muscle layer Can contract- Vasoconstriction

    ARTERIES
    have elastic fibers & ELASTIC MEMBRANE
  7. Tunica Externa (Adventitia)
    Superficial Layer (attaches to other vessels & organs)

    CT (Elastic & Collagen fibers)
  8. Blood Pressure Hill
    • Aorta
    • Arteries
    • Arterioles
    • Capillaries
    • Venules
    • Veins
    • Vena Cavae
  9. Arteries
    • Carry Blood AWAY from heart
    • -Often carry Oxygenated blood

    Show Contractability & elasticity


    Sometimes handles dramatic BLOOD PRESSURE changes

    May be either ELASTIC ARTERIES or MUSCULAR ARTERIES
  10. Elastic Arteries
    Conducting Arteries
  11. Muscular Arteries
    Distribution Arteries
  12. Conducting Arteries Characteristics
    Move LG amount of blood away from heart

    • LG Diameter (1 in)
    • -THIN Vessel Wall

    • LG amount of elastic fibers
    • - Less smooth muscle

    LG Pressure changes
  13. Conducting Arteries EXAMPLES
    • Pulmonary Arteries
    • Aorta
    • Common Carotid
    • Subclavian
    • Common Iliac arteries
  14. Disctibution Arteries (CHARACTERISTICS)
    Move blood to muscle & internal organs

    • Small diameter
    • - THICK vessel wall

    LG Vessel Wall

    • LG amount of smooth muscle
    • LESS ELASTIC FIBERS


    Undergo vasodilation & vasoconstriction
  15. Distribution Arteries EXAMPLES
    • Brachial arteries
    • External Carotid
    • Femoral
    • Mesenteric Arteries
  16. Arterioles
    Same tunics as arteries much thinner

    Eventually lose tunica externa

    Have scattered smooth muscle fibers

    IMPORTANt in directing blood flow Towards, or away from, organs

    • Major site for:
    • Vasoconstriction
    • Vasodilation
  17. Capillaries
    1 layer (tunic) thick (endothelium & basal lamina)

    Microscopic diameter (single RBC can pass)

    Located w/in organs

    • lose fluid @ arteriole end Raise BP
    • Reclain fluid @ Venule-- Lower BP

    Site for diffusion : Gases, nutrients, Waste, Fluid
  18. Capillaries Lose fluid @
    Arteriole and RAISE pressure

    Reclaim fluid at venule and LOWER pressure
  19. Precapillary Sphincters
    Tiny Strips of smooth muscle surrounding capillary branches

    • Act as valves to regulate blood flow through capillary beds
    • (Skin: Skin Vascular beds)
  20. Venules
    • Tunica Externa
    • Tunica Media
    • Tunica Interna

    Begins flow towards heart

    VERY LOW Blood Pressure

    Blood USUALLY low in oxygen

    Venules combine to form veins
  21. Veins
    • 3 Tunics Thinner walls larger Lumen
    • -Lil ability to contract or recoil
    • - Display dispensibility
    • - Can hold a lot of blood
  22. Superficial & Deep set of veins
    Blood ca nbe "shunted" directed
  23. Veins Pressure
    Very low

    Too low to move blood
  24. Movement of Blood through veins
    One way valves

    Muscular Contractions

    Breathing (Thorocolumbar Pump)
  25. One way Valves
    Prevent backflow

    Partition blood into sections

    Mainly found in limbs
  26. Muscular Contractions
    Veins positioned near skeletal muscle in limbs

    Muscle "squeezes" on wall of vein
  27. Breathing (Thorocolumbar Pump)
    PUMPS blood in anterior cavity
  28. Vericose Vei ns
    Breakdown of valve structure

    Valve no longer one way

    Blood Backflows

    Usually in legs
  29. Arteries GENERAL appearances
    Round

    No valves

    Smaller Lumen

    Thicker Walls
  30. Veins GENREAL Appearances
    Flattened

    Valves

    Larger Lumen

    Thinner Walls
  31. Arteries TUNICA INTERNA
    RIPPLED

    Internal ELASTIC MEMBRANE
  32. Veins TUNICA INTERNA
    SMOOTH

    NO elastic membrane
  33. Arteries TUNICA Media
    Many elastic Fibers

    Elastic Membrane
  34. Veins TUNICA MEDIA
    NO elastic fibers

    NO Elastic membrane
  35. Arteries TUNICA EXTERNA
    Elastic & Collagen Fibers
  36. Veins Tunica Externa
    Elastic & Collagen fibers

    Smooth Muscle fibers

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