The Cardiovascular System: Blood Vessels and Circulation Chapter 20 Quiz
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Questions and Answers

What is the role of vasa vasorum in blood vessels?

  • Act as a barrier to prevent substances from entering the vessel walls
  • Control blood pressure through vasoconstriction
  • Prevent backflow of blood in veins
  • Deliver nutrients and remove waste from the cells of large vessels (correct)

    • What is the purpose of valves in veins?

  • Ensure smooth blood flow in arteries
  • Promote vasoconstriction
  • Increase blood pressure
  • Prevent backflow of blood (correct)

    • Which type of capillary has pores and is permeable to larger molecules?

  • Sinusoid capillaries
  • Metarteriole capillaries
  • Fenestrated capillaries (correct)
  • Continuous capillaries

    • What is the function of precapillary sphincters?

    <p>Regulate blood flow into capillary beds</p> Signup and view all the answers

    How is systolic blood pressure defined?

    <p>Pressure during ventricular contraction</p> Signup and view all the answers

    What is the purpose of measuring pulse pressure?

    <p>Assess the expansion of the artery due to ejected blood</p> Signup and view all the answers

    How does an increase in vessel radius affect blood flow and pressure?

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

    What factor primarily determines the viscosity of blood?

    <p>Blood volume</p> Signup and view all the answers

    What does Mean Arterial Pressure (MAP) represent?

    <p>The average arterial pressure during a cardiac cycle</p> Signup and view all the answers

    Why are veins considered as blood reservoirs?

    <p>Because they have thin walls with large lumens and contain venous reserve</p> Signup and view all the answers

    What is the purpose of the skeletal muscle pump in the venous system?

    <p>To put pressure on veins to force blood back toward the heart</p> Signup and view all the answers

    Which of the following molecules can move through intercellular clefts in capillaries?

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

    What is the function of the lymphatic system in the vascular system?

    <p>To pick up extra fluid and eventually dump it into the subclavian vein</p> Signup and view all the answers

    What is the primary function of bulk flow in capillary exchange?

    <p>To push fluid out of capillaries and into tissues</p> Signup and view all the answers

    Which hormone targets the kidneys to reabsorb water, thereby increasing blood volume and pressure?

    <p>Antidiuretic Hormone (ADH)</p> Signup and view all the answers

    What is the main role of Renin-Angiotensin-Aldosterone mechanism in the vascular system?

    <p>To regulate blood pressure by producing vasoconstrictors</p> Signup and view all the answers

    Which of the following hormones suppresses renin, antidiuretic hormone (ADH), and aldosterone secretion?

    <p>Atrial Natriuretic Hormone</p> Signup and view all the answers

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