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

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

  • Generate white blood cells
  • Increase blood pressure
  • Produce red blood cells
  • Deliver nutrients and remove waste from large vessel cells (correct)

    • Which layer of a blood vessel is innervated by nervi vasorum and controlled by hormones and local chemicals?

  • Tunica media (correct)
  • Tunica intima
  • Tunica externa
  • Internal elastic membrane

    • What is the main function of arterioles in the circulatory system?

  • Slow down blood flow and decrease blood pressure
  • Supply blood to tissues by perfusion (correct)
  • Act as a reservoir for blood
  • Lead blood to the heart

    • Which type of capillary has pores that make it permeable to larger molecules?

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

    What is the primary function of precapillary sphincters in capillary beds?

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

    Why do veins have valves along their length?

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

    What does the term 'pulse pressure' represent in the context of blood pressure?

    <p>Difference between systolic and diastolic pressure</p> Signup and view all the answers

    What is the concern if mean arterial pressure (MAP) falls below 60 mm Hg for an extended period?

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

    What factor affects blood flow by increasing resistance if arteries are not compliant?

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

    What is the function of the skeletal muscle pump in the cardiovascular system?

    <p>To contract leg muscles to force blood back toward the heart</p> Signup and view all the answers

    Which mechanism decreases resistance in a vein and increases blood flow?

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

    How does water move across capillaries according to the text?

    <p>By osmosis</p> Signup and view all the answers

    Which of the following is responsible for regulating vessel tone or contraction?

    <p>Vasomotor centers</p> Signup and view all the answers

    What is the main role of Antidiuretic Hormone (ADH) in the cardiovascular system?

    <p>Target kidneys to reabsorb water to increase blood volume and pressure</p> Signup and view all the answers

    Which factor stimulates erythrocyte production in bone marrow?

    <p>Erythropoietin (EPO)</p> Signup and view all the answers

    What initiates the Renin-Angiotensin-Aldosterone Mechanism in the cardiovascular system?

    <p>Increase in blood flow</p> Signup and view all the answers

    What causes fluid reabsorption back into capillaries according to the text?

    <p>Osmotic pressure in capillaries</p> Signup and view all the answers

    Which receptors monitor oxygen, carbon dioxide, and pH levels in the cardiovascular system?

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

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

    <p>Increases pressure and resistance in an artery but decreases flow</p> Signup and view all the answers

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