Haematology: Anatomy of Deep Venous Structures and Vein Features
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Questions and Answers

What is the main function of the intima in the venous system?

  • To promote thrombogenesis (correct)
  • To regulate blood flow through muscular contraction
  • To provide structural support
  • To facilitate gas exchange

    • Which of the following factors contributes to venous flow against gravity?

  • Abdominal pressure
  • Thoracic pressure
  • Arterial inflow
  • Venous pumping (correct)

    • What is the primary effect of high intra-abdominal pressure on venous return?

  • It has no effect on venous return
  • It increases venous flow towards the heart
  • It decreases venous pressure in the abdominal veins
  • It impedes venous return from the lower limbs (correct)

    • What is the result of retrograde flow in the venous system?

    <p>Venous hypertension</p> Signup and view all the answers

    What is the role of the adventitia in the venous system?

    <p>To provide structural support</p> Signup and view all the answers

    What is the effect of negative intrathoracic pressure on venous flow?

    <p>It decreases the pressure within the thoracic veins</p> Signup and view all the answers

    What percentage of venous blood return to the heart is attributed to the deep veins?

    <p>90-95%</p> Signup and view all the answers

    What is the primary function of the valves in the superficial, deep, and perforating veins?

    <p>To facilitate unidirectional flow from superficial to deep and caudal to cephalad</p> Signup and view all the answers

    What is the result of increased abdominal cavity pressure during inspiration?

    <p>Decreased blood return from the lower extremities</p> Signup and view all the answers

    What is the ejection fraction of the calf muscle pump?

    <p>65%</p> Signup and view all the answers

    What is the longest vein in the body?

    <p>Great Saphenous Vein</p> Signup and view all the answers

    What is the function of the perforating veins?

    <p>To connect superficial to deep veins</p> Signup and view all the answers

    What is the result of valve closure in the superficial, deep, and perforating veins?

    <p>Passive process dependent on the local transvalvular pressure gradient</p> Signup and view all the answers

    What is the common site for primary varicose veins?

    <p>Boyd’s perforators</p> Signup and view all the answers

    What is the result of deep vein thrombosis?

    <p>All of the above</p> Signup and view all the answers

    What is the origin of pulmonary emboli?

    <p>Deep venous system of the lower extremities</p> Signup and view all the answers

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