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

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

  • To regulate blood volume in the kidneys
  • To facilitate gas exchange in capillaries
  • To increase arterial pressure
  • To put pressure on veins to force blood back toward the heart (correct)

    • Which of the following statements regarding venoconstriction is true?

  • It decreases resistance in veins and increases flow
  • It has no effect on blood pressure
  • It facilitates capillary exchange in the venous system
  • It increases resistance in veins and decreases flow (correct)

    • What is the role of osmotic pressure in capillary exchange?

  • To facilitate reabsorption of fluids back into capillaries (correct)
  • To increase hydrostatic pressure in tissues
  • To decrease the filtration rate in capillaries
  • To push fluid out of capillaries into tissues

    • Which of the following hormones targets the kidneys to reabsorb water, increasing blood volume and pressure?

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

    What is the function of Renin in the Renin-Angiotensin-Aldosterone Mechanism?

    <p>Produce a powerful vasoconstrictor, Angiotensin 2</p> Signup and view all the answers

    How does the lymphatic system handle excess fluid filtered out by capillaries?

    <p>By dumping it into the subclavian vein in the neck</p> Signup and view all the answers

    What is the primary role of Chemoreceptors in vascular regulation?

    <p>Monitor O2, CO2, and H ions (pH)</p> Signup and view all the answers

    How does Vasoconstriction impact blood flow in arteries?

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

    Which factor contributes to bulk flow according to the text?

    <p>Filtration moving fluids from low pressure tissues to high pressure capillaries</p> Signup and view all the answers

    What role does Erythropoietin play in vascular homeostasis?

    <p>Stimulates erythrocyte production, leading to increased blood viscosity and resistance</p> Signup and view all the answers

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

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

    In which type of blood vessel is the tunica media much thicker?

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

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

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

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

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

    What is the function of valves in veins?

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

    What is the formula for calculating mean arterial pressure (MAP)?

    <p>(Diastolic BP + (Systolic BP - Diastolic BP)) / 3</p> Signup and view all the answers

    What happens if mean arterial pressure (MAP) falls below 60 mm Hg for an extended period of time?

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

    Which factor would increase both blood pressure and blood flow in the circulatory system?

    <p>Increased vessel radius</p> Signup and view all the answers

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