16 Questions
What is the main function of the intima in the venous system?
To promote thrombogenesis
Which of the following factors contributes to venous flow against gravity?
Venous pumping
What is the primary effect of high intra-abdominal pressure on venous return?
It impedes venous return from the lower limbs
What is the result of retrograde flow in the venous system?
Venous hypertension
What is the role of the adventitia in the venous system?
To provide structural support
What is the effect of negative intrathoracic pressure on venous flow?
It decreases the pressure within the thoracic veins
What percentage of venous blood return to the heart is attributed to the deep veins?
90-95%
What is the primary function of the valves in the superficial, deep, and perforating veins?
To facilitate unidirectional flow from superficial to deep and caudal to cephalad
What is the result of increased abdominal cavity pressure during inspiration?
Decreased blood return from the lower extremities
What is the ejection fraction of the calf muscle pump?
65%
What is the longest vein in the body?
Great Saphenous Vein
What is the function of the perforating veins?
To connect superficial to deep veins
What is the result of valve closure in the superficial, deep, and perforating veins?
Passive process dependent on the local transvalvular pressure gradient
What is the common site for primary varicose veins?
Boyd’s perforators
What is the result of deep vein thrombosis?
All of the above
What is the origin of pulmonary emboli?
Deep venous system of the lower extremities
Test your knowledge of the anatomy of deep venous structures relevant to thrombosis and pulmonary embolism, including the features of veins and the factors responsible for flow in the veins. Learn about the three concentric layers of veins and how they function. A must-know for haematology students!
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