Venous System: Venules and Veins Overview
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Questions and Answers

What is the common pulse site located on the neck?

  • Femoral artery
  • Radial artery
  • Brachial artery
  • Carotid artery (correct)

    • What effect does an increase in cardiac output have on blood pressure and blood flow?

  • Decreases blood pressure and blood flow
  • Decreases blood pressure, increases blood flow
  • Increases blood pressure, decreases blood flow
  • Increases blood pressure and blood flow (correct)

    • Which factor contributes to increased resistance in blood vessels?

  • Increased compliance
  • Increased vessel radius
  • Thinner blood viscosity
  • Longer vessel length (correct)

    • How does decreased blood volume (hypovolemia) affect blood pressure?

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

    Where should the cuff be placed during blood pressure measurement for accurate readings?

    <p>Around the arm at the level of heart</p> Signup and view all the answers

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

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

    What is the function of the vasa vasorum in blood vessels?

    <p>Delivering nutrients and removing waste from the cells of the large vessels</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 main function of vasoconstriction in blood vessels?

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

    Which component separates the tunica media from the outer tunic in large arteries?

    <p>External elastic membrane</p> Signup and view all the answers

    What is the main function of the tunica externa in blood vessels?

    <p>Holding the vessel in position as it binds with surrounding tissues</p> Signup and view all the answers

    Which type of artery has a diameter ranging from 0.1mm to 10mm and is characterized by having less elastic fiber and more muscle fiber?

    <p>Muscular artery</p> Signup and view all the answers

    What is the main function of capillaries?

    <p>To supply blood to tissues by perfusion</p> Signup and view all the answers

    In which type of capillary does blood flow very slowly due to its flat structure with big gaps and incomplete basement membrane?

    <p>Sinusoid capillary</p> Signup and view all the answers

    What is the purpose of precapillary sphincters in the circulatory system?

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

    Why is it important that not all precapillary sphincters are open simultaneously?

    <p>To ensure every drop of blood is in a capillary bed</p> Signup and view all the answers

    What distinguishes an arteriovenous anastomosis in the circulatory system?

    <p>Connection between an arteriole and venule bypassing capillaries</p> Signup and view all the answers

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

    <p>Facilitate the exchange of substances with surrounding tissues</p> Signup and view all the answers

    Why do veins have valves?

    <p>To prevent backflow due to low pressure and gravity</p> Signup and view all the answers

    What is considered the venous reserve in the human body?

    <p>Blood in the bone marrow, liver, and integument</p> Signup and view all the answers

    How is blood flow measured?

    <p>As volume of blood per unit of time through vessel, tissue, and organ</p> Signup and view all the answers

    What does MAP stand for in the context of blood pressure?

    <p>Mean Arterial Pressure</p> Signup and view all the answers

    When is pulse pressure considered high?

    <p>After strenuous exercise</p> Signup and view all the answers

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