Blood Vessels

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Blood Vessels
2011-09-15 11:01:37
Blood Vessels

Study Guide for Chapter 21
Show Answers:

  1. What is the Classification of Blood Vessels?
    • * Arteries
    • *Arterioles
    • *Capillaries
    • *Venules
    • *Veins
  2. What are arteries?
    Carry blood away from heart
  3. What are arterioles?
    They are the smalles branches of arteries
  4. What are capillaries?
    • *They are the smalles blood vessels
    • *Location of exchange between blood and interstitial fluid
  5. What are venules?
    They collect blood from capillaries
  6. What are veins?
    They return blood to the heart
  7. Outline:

    • Arteries~ Elastic, Muscular, and Aterole
    • Capillary~ Continuous, Fenestrated, and Sinosoids
    • Vein~ Large, Medium, Venule goes to valve
  8. What are Elastic arteries?
    • Aorta and pulmonary vessels
    • Lots of elastic tissue**

    **note: Why? know for test
  9. What are Muscular arteries?
    • Femoral and carotid arteries
    • More smooth muscles**

    **note: Why? know for test
  10. What are Arterioles?
    • They are much smaller than muscular arteries
    • More smooth muscles**

    **note: Why? know for test

    • Vasoconstriction (know definition)
    • Vasodilation (know definition)
    • All about smooth muscle cells
  11. What are Large veins?
    • Superior and inferior vena cava
    • Thick tunica externa with elastic and collagen fibers
  12. What are Medium veins?
    Relatively few smooth muscles cells in tunica media
  13. What are Venules?
    • They are the smallest.
    • They collect blood from capillary beds
  14. What are Valves?
    • They are below the heart
    • They prevent backflow to the capillaries and assist venous return
    • Blood pressure in a peripheral venule is only about 10 percent of that in the ascending aorta, and pressures continue to fall along the venous system.
    • The blood pressure in venules and medium–sized veins is so low that it cannot oppose the force of gravity. In the limbs, veins of this size contain valves, folds of the tunica intima that project from the vessel wall and point in the direction of blood flow. These valves act like the valves in the heart in that they permit blood flow in one direction only. As long as the valves function normally, any movement that distorts or compresses a vein will push blood toward the heart. This effect improves venous return. The mechanism is particularly important when you are standing, because blood returning from your feet must overcome the pull of gravity to ascend to the heart. When you lie down, venous valves have much less impact on venous return, because your heart and major vessels are at the same level.
  15. Differences between arteries and veins?

  16. Artery and Vein diagram
  17. Capillaries comparison and definition
    They are the only vessels whose walls allow exchange between blood and the surrounding interstitial fluid.

  18. Know Capillary structure parts
    • Has endothelial tube, inside thin basal lamina
    • No tunica media
    • No tunica externa
    • Diameter is similar to red blood cell