Venous System: Venules and Veins
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Questions and Answers

How does an increase in cardiac output affect blood pressure and blood flow?

  • Increase blood pressure but decrease blood flow
  • Decrease both blood pressure and blood flow
  • Decrease blood pressure but increase blood flow
  • Increase both blood pressure and blood flow (correct)
  • What is the impact of decreased compliance of arteries on blood pressure and blood flow?

  • Increase blood pressure and increase blood flow (correct)
  • Decrease blood pressure and decrease blood flow
  • Increase blood pressure and decrease blood flow
  • Decrease blood pressure and increase blood flow
  • How does the viscosity of blood affect blood pressure?

  • Reduce blood flow
  • No effect on pressure
  • Increase pressure (correct)
  • Decrease pressure
  • What happens to blood flow if a vessel becomes narrower and longer?

    <p>Decrease flow and increase pressure</p> Signup and view all the answers

    How does a decrease in blood volume (hypovolemia) affect blood pressure?

    <p>Decrease blood pressure</p> Signup and view all the answers

    What is the main function of arteries in the cardiovascular system?

    <p>To help maintain blood pressure</p> Signup and view all the answers

    Which layer of the blood vessel is primarily composed of smooth muscle supported by connective tissue?

    <p>Tunica Media</p> Signup and view all the answers

    What is the role of vasa vasorum in the cardiovascular system?

    <p>Delivering nutrients and removing waste from large vessels</p> Signup and view all the answers

    Which statement best describes vasoconstriction in blood vessels?

    <p>Decreases blood flow and increases blood pressure</p> Signup and view all the answers

    What is the function of the external elastic membrane in larger arteries?

    <p>Supports the structure with flexibility</p> Signup and view all the answers

    Which type of blood vessel has valves to prevent backward flow of blood?

    <p>Veins</p> Signup and view all the answers

    What is the primary function of venules in the circulatory system?

    <p>Return blood back toward the heart</p> Signup and view all the answers

    Which structure in the venous system helps prevent backflow of blood?

    <p>Veins</p> Signup and view all the answers

    What is the main function of systolic blood pressure?

    <p>It measures the pressure during ventricular contraction</p> Signup and view all the answers

    What is diastolic blood pressure a measure of?

    <p>The pressure during ventricular relaxation</p> Signup and view all the answers

    What is the purpose of pulse pressure in the cardiovascular system?

    <p>To indicate the difference between systolic and diastolic blood pressure</p> Signup and view all the answers

    If mean arterial pressure (MAP) falls below 60 mm Hg for a prolonged period, what is a potential concern?

    <p>Risk of ischemia and hypoxia</p> Signup and view all the answers

    What is the function of arterioles in the cardiovascular system?

    <p>To lead blood from arteries to capillaries</p> Signup and view all the answers

    Why are capillaries considered microscopic vessels?

    <p>Due to their thin walls</p> Signup and view all the answers

    What is the main characteristic of continuous capillaries?

    <p>Complete endothelial lining with tight junctions</p> Signup and view all the answers

    How do arterioles contribute to maintaining blood pressure?

    <p>By being muscular and slightly contracted</p> Signup and view all the answers

    What is the role of metarterioles in the cardiovascular system?

    <p>To control blood flow into a capillary bed</p> Signup and view all the answers

    Why do precapillary sphincters remain closed until needed?

    <p>To ensure proper oxygen distribution and waste removal</p> Signup and view all the answers

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