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Ch 19 Heart test p2

  1. Which of these vessels receives blood during ventricular systole?



    C) both the aorta and pulmonary trunk
  2. Which of the following is not part of the conduction system of the heart?



    B) AV valve
  3. The tricuspid valve is closed ________.



    C) when the ventricle is in systole
  4. When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________.



    C) noticing the thickness of the ventricle walls
  5. Select the correct statement about the heart valves.



    B) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
  6. Select the correct statement about the function of myocardial cells.



    A) The entire heart contracts as a unit or it does not contract at all.
  7. Select the correct statement about the structure of the heart wall.



    D) The myocardium is the layer of the heart that actually contracts.
  8. Compared to skeletal muscle, cardiac muscle ________.



    A) has gap junctions that allow it to act as a functional syncytium
  9. During the period of ventricular filling ________.



    D) blood flows passively through the atria and the open AV valves into the ventricles
  10. The second heart sound is heard during which phase of the cardiac cycle?



    A) isovolumetric relaxation
  11. The time of day most hazardous for heart attacks is ________.



    B) morning
  12. If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________.



    D) threshold is reached more quickly and heart rate would increase
  13. Select the correct statement about cardiac output.



    B) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction.
  14. During contraction of heart muscle cells ________.



    D) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
  15. Isovolumetric contraction ________.



    C) refers to the short period during ventricular systole when the ventricles are completely closed chambers
  16. Commotio cordis is heart failure due to a ________.



    B) relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when theheart is repolarizing
Author
eddardofwinter
ID
271717
Card Set
Ch 19 Heart test p2
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