Block 3 Circulatory System Brs

10 Questions

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Circulatory System Quizzes & Trivia

Questions and Answers
  • 1. 
    The epicardium is one of the three layers of the heart. It is:
    • A. 

      Continuous with the endocardium

    • B. 

      Also known as the visceral pericardium

    • C. 

      Composed of modified cardiac muscle cells

    • D. 

      Capable of increasing intraventricular pressure

    • E. 

      Capable of decreasing the rate of contraction

  • 2. 
    The atrial muscle of the heart produces a hormone that
    • A. 

      Decreases blood pressure

    • B. 

      Increases blood pressure

    • C. 

      Causes vasoconstriction

    • D. 

      Facilitates the release of renin

    • E. 

      Facilitates sodium resorption in the kidneys

  • 3. 
    The generation of impulses in the normal heart is the responsibility of which of the following structures?
    • A. 

      Atrioventficular (AV) node

    • B. 

      AV bundle of His

    • C. 

      Sympathetic nerves

    • D. 

      Sinoatrial (SA) node

    • E. 

      Purkinje fibers

  • 4. 
    • A. 

      Function to control blood flow into arterioles

    • B. 

      Possess a complete layer of smooth muscle cells in their tunics. media

    • C. 

      Possess precapillary sphincters

    • D. 

      Receive blood from thoroughfare channels

    • E. 

      Possess valves to regulate the direction of blood flow

  • 5. 
    Which of the following statements concerning innervation of blood vessels is true?
    • A. 

      Vasoconstriction is controlled by parasympathetic nerve fibers.

    • B. 

      Acetylcholine acts directly on smooth muscle cells

    • C. 

      Acetylcholine acts directly on endothelial cells.

    • D. 

      Vasodilation is controlled by sympathetic nerve fibers

  • 6. 
    Which of the following characteristics distinguishes somatic capillaries from visceral capillaries?
    • A. 

      Presence or absence of fenestrae

    • B. 

      Size of the lumen

    • C. 

      Thickness of the vessel wall

    • D. 

      Presence or absence of pericytes

    • E. 

      Thickness of the basal lamina

  • 7. 
    The blood-brain barrier is thought to occur because capillaries in the central nervous system (CNS) have which of the following characteristics?
    • A. 

      Discontinuous basal lamina

    • B. 

      Fenestrae with diaphragms

    • C. 

      Fenestrae without diaphragms

    • D. 

      A few pinocytic vesicles

    • E. 

      No basement membrane

  • 8. 
    Which of the following statements about healthy, intact capillaries is true?
    • A. 

      They control blood pressure

    • B. 

      They are lined by a simple columnar epithelium

    • C. 

      They have a smooth muscle coat.

    • D. 

      They inhibit clot formation

    • E. 

      Satellite cells share their basal lamina

  • 9. 
    • A. 

      Mitral valve stenosis

    • B. 

      Tetralogy of Fallot

    • C. 

      Pulmonary artery aneurysm

    • D. 

      Coronary heart disease

  • 10. 
    Diagnostic tests for ischemic heart disease usually reveal
    • A. 

      Malformed heart valves

    • B. 

      Atherosclerosis of coronary arteries

    • C. 

      Irregular heartbeat

    • D. 

      Faulty sinoatrial valve