Biomed 100 Practice Quiz
Chapter 13, Fall 2006
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Multiple Choice - One Correct Choice Per Question
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  1. The myocardium is...
    1. usually the thickest layer of the heart wall
    2. usually thicker in the atria than in the ventricles
    3. usually thicker in the ventricles than in the atria
    4. both A. and B.
    5. both A. and C.
      6.

  2. The right atrium receives blood from the...
    1. aorta
    2. right ventricle
    3. coronary arteries
    4. pulmonary arteries
    5. superior vena cava and inferior vena cava
      6.

  3. Valves are not present in the openings between the _?_ and the _?_.
    1. the openings between the veins and the atria
      2.
    2. the openings between the atria and the ventricles
    3. the openings between the ventricles and the arteries

  4. In a normal cardiac cycle, the _?_ contract and relax together as a coordinated unit.
    1. right atrium and right ventricle
    2. right ventricle and left ventricle
      3.
    3. both of the above
    4. none of the above

  5. The most direct cause of "heart sounds," such as the first heart sound and the second heart sound, is...
    1. large volumes of blood entering the atria
    2. contraction of cardiac muscle tissue
    3. opening of heart valves
    4. closing of heart valves
      5.
    5. presence of atherosclerotic plaques in coronary arteries

  6. The function of the sinoatrial node is to...
    1. initiate the electrical stimulus for contraction of heart muscle
      2.
    2. prevent backflow of blood from right ventricle to right atrium
    3. carry oxygenated blood into heart muscle
    4. collect deoxygenated blood returning from heart muscle
    5. none of the above

  7. Organs such as the brain, muscles, and kidneys...
    1. receive blood that was pumped by the left ventricle into the aorta.
    2. receive blood that passed through systemic arteries.
    3. have the blood collected from them by pulmonary veins.
    4. both A. and B.
      5.
    5. both B. and C.

  8. The "left heart" (left side of the heart)
    1. contains oxygenated blood
    2. includes the left atrium, which receives blood from the pulmonary veins
    3. includes the left ventricle, which pumps blood into the aorta
    4. all of the above
      5.

  9. The myocardium (heart muscle) receives its oxygen from...
    1. branches of the pulmonary veins
    2. branches of the pulmonary trunk
    3. branches of the coronary arteries
      4.
    4. branches of the cardiac veins
    5. branches of the coronary sinus

  10. Ventricular systole is...
    1. a period of time, within the cardiac cycle, during which both ventricles are contracting
      2.
    2. the longest part of the cardiac cycle.
    3. both of the above.
    4. none of the above.

  11. It would be considered normal for large amounts of blood to flow from arteries to...
    1. atria of the heart
    2. ventricles of the heart
    3. both of the above
    4. none of the above
      5.

  12. True or false? In a normally functioning conduction system, electrical current passes through the Purkinge fibers before it passes through the atrioventricular (AV) node.
    1. True.
    2. False.
      3.