Heart: Exam 1

36 Questions | Total Attempts: 40

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Event Quizzes & Trivia

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Questions and Answers
  • 1. 
    Normal heart sounds are caused by which of the following events?
    • A. 

      Closure of the heart valves

    • B. 

      Opening and closing of the heart valves

    • C. 

      Friction of blood against the chamber walls

    • D. 

      Excitation of the SA node

  • 2. 
    The source of blood carried to capillaries in the myocardium would be the __________________________.
    • A. 

      Coronary veins

    • B. 

      Coronary sinus

    • C. 

      Fossa ovalis

    • D. 

      Coronary arteries

  • 3. 
    Hemorrhage with a large loss of blood causes _________________________.
    • A. 

      A rise in blood pressure due to change in cardiac output

    • B. 

      A lowering of blood pressure due to change in cardiac output

    • C. 

      No change in blood pressure but a slower heart rate

    • D. 

      No change in blood pressure but a change in respiration

  • 4. 
    The left ventricular wall of the heart is thicker than the right wall in order to ___________________________.
    • A. 

      Expand the thoracic cage during diastole

    • B. 

      Pump blood with great pressure

    • C. 

      Pump blood through a smaller valve

    • D. 

      Accommodate a great volume of blood

  • 5. 
    Select the correct statement about cardiac output.
    • A. 

      A slow heart rate increases end diastolic volume, stroke volume, and force of contraction

    • B. 

      Stoke volume increases if end diastolic volume decreases.

    • C. 

      If a semilunar value were partially obstructed, the end systolic volume in the affected ventricle would be decreased.

    • D. 

      Decreased venous return will result in increased end diastolic volume

  • 6. 
    Which of these vessels receives blood during ventricular systole?
    • A. 

      Both the aorta and pulmonary track

    • B. 

      Pulmonary veins only

    • C. 

      Aorta only

    • D. 

      Pulmonary arteries only

  • 7. 
    Commotio cordis is heart failure due to a ___________________.
    • A. 

      Severe electrical shock to the body

    • B. 

      Mild electrical shock to the heart itself

    • C. 

      Loss of blood from an artery

    • D. 

      Relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is re-polarizing

  • 8. 
    Foramen ovule _____________________________.
    • A. 

      Connects the two atria in the fetal heart

    • B. 

      Is a connection between the pulmonary trunk and the aorta in the fetus

    • C. 

      Is a shallow depression in the inter ventricular septum

    • D. 

      Is a condition in which the heart valves do not completely close

  • 9. 
    The time of day most hazardous for heart attacks is ________________.
    • A. 

      Morning

    • B. 

      Noontime

    • C. 

      Evening

    • D. 

      During sleep

  • 10. 
    Damage to the __________________ is referred to as heart block.
    • A. 

      AV valves

    • B. 

      SA node

    • C. 

      AV node

    • D. 

      AV bundle

  • 11. 
    During the period of ventricular filling ______________________________________.
    • A. 

      The atria remain in diastole.

    • B. 

      It is represented by the P wave on the ECG

    • C. 

      Blood flows passively through the atria and the open AV valves into the ventricles

    • D. 

      Pressure in the heart is at its peak

  • 12. 
    Which vessel of the heart receives blood during right ventricular systole?
    • A. 

      Aorta

    • B. 

      Venae cavae

    • C. 

      Pulmonary veins

    • D. 

      Pulmonary trunk

  • 13. 
    Which of the events below does not occur when the semilunar valves are open?
    • A. 

      Ventricle are in systole

    • B. 

      Blood enters pulmonary arteries and the aorta

    • C. 

      Ventricles are in diastole

    • D. 

      AV valves are closed

  • 14. 
    The tricuspid valve is closed _________________________.
    • A. 

      By the movement of blood from atrium to ventricle

    • B. 

      While the ventricle is in diastole

    • C. 

      While the atrium is contracting

    • D. 

      When the ventricle is in systole

  • 15. 
    • A. 

      Gender

    • B. 

      Body temperature

    • C. 

      Age

    • D. 

      Skin color

  • 16. 
    The P wave of a normal electrocardiogram indicates _____________________________.
    • A. 

      Atrial depolarization

    • B. 

      Atrial re-polarization

    • C. 

      Ventricular depolarization

    • D. 

      Ventricular re-polarization

  • 17. 
    If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells _______________________.
    • A. 

      Tetanic contractions might occur, which would stop the heart's pumping action

    • B. 

      It would be less than 1--2 ms

    • C. 

      It would be much longer before cardiac cells could respond to a second stimulation

    • D. 

      Contractions would last as long as the refractory period

  • 18. 
    The second heart sound is heard during which phase of the cardiac cycle?
    • A. 

      Isovolumetric contraction

    • B. 

      Ventricular ejection

    • C. 

      Isovolumetric relaxation

    • D. 

      Ventricular filling

  • 19. 
    Which of the following is not part of the conduction system of the heart?
    • A. 

      AV node

    • B. 

      AV valve

    • C. 

      SA node

    • D. 

      Bundle of His

  • 20. 
    The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it _________________________.
    • A. 

      Expands the thoracic cage

    • B. 

      Pumps blood against a greater resistance

    • C. 

      Sends blood through a smaller valve

    • D. 

      Pumps a greater volume of blood

  • 21. 
    If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________________________________________.
    • A. 

      Heart rate would decrease, but blood pressure would rise due to the excess sodium present

    • B. 

      Potassium channels compensate and no change in heart rate would occur

    • C. 

      Threshold is reached more quickly and heart rate would increase

    • D. 

      Tetanic contraction would occur due to the short absolute refractory period of cardiac muscle

  • 22. 
    Compared to skeletal muscle, cardiac muscle ___________________________________.
    • A. 

      Has gap junctions that allow it to act as a functional syncytium

    • B. 

      Lacks striations

    • C. 

      Has more nuclei per cell

    • D. 

      Cells are larger than skeletal muscle cells

  • 23. 
    Select the correct statement about the heart valves.
    • A. 

      Aortic and pulmonary valves control the flow of blood into the heart

    • B. 

      The tricuspid valve divides the left atrium from the left ventricle

    • C. 

      The mitral valve separates the right atrium from the right ventricle

    • D. 

      The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur

  • 24. 
    Small muscle masses attached to the chordae tendineae are the _______________________
    • A. 

      Venae cavae

    • B. 

      Trabecular carneae

    • C. 

      Pectinate muscles

    • D. 

      Papillary muscles

  • 25. 
    Which of the following is not an age-related change affecting the heart?
    • A. 

      Atherosclerosis

    • B. 

      Decline in cardiac reserve

    • C. 

      Fibrosis of cardiac muscle

    • D. 

      Thinning of the valve flaps