Ch 19 Heart test p2

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Author:
eddardofwinter
ID:
271717
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Ch 19 Heart test p2
Updated:
2014-04-24 00:17:04
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  1. Which of these vessels receives blood during ventricular systole?
    A) pulmonary arteries only
    B) both the aorta and pulmonary trunk
    C) aorta only
    D) pulmonary veins only
    B) both the aorta and pulmonary trunk
    (this multiple choice question has been scrambled)
  2. Which of the following is not part of the conduction system of the heart?
    A) AV node
    B) SA node
    C) AV valve
    D) bundle of His
    C) AV valve
    (this multiple choice question has been scrambled)
  3. The tricuspid valve is closed ________.
    A) by the movement of blood from atrium to ventricle
    B) when the ventricle is in systole
    C) while the atrium is contracting
    D) while the ventricle is in diastole
    B) when the ventricle is in systole
    (this multiple choice question has been scrambled)
  4. When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________.
    A) tracing out where the auricles connect
    B) locating the apex
    C) noticing the thickness of the ventricle walls
    D) finding the papillary muscles
    C) noticing the thickness of the ventricle walls
    (this multiple choice question has been scrambled)
  5. Select the correct statement about the heart valves.
    A) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
    B) The mitral valve separates the right atrium from the right ventricle.
    C) Aortic and pulmonary valves control the flow of blood into the heart.
    D) The tricuspid valve divides the left atrium from the left ventricle.
    A) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.
    (this multiple choice question has been scrambled)
  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.
    B) The refractory period in skeletal muscle is much longer than that in cardiac muscle.
    C) Each cardiac muscle cell is innervated by a sympathetic nerve ending so that the nervous system can increase heart rate.
    D) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.
    A) The entire heart contracts as a unit or it does not contract at all.
    (this multiple choice question has been scrambled)
  7. Select the correct statement about the structure of the heart wall.
    A) The heart chambers are lined by the endomysium.
    B) The fibrous skeleton forms the bulk of the heart.
    C) The myocardium is the layer of the heart that actually contracts.
    D) Connective tissue in the heart wall aids in the conduction of the action potential.
    C) The myocardium is the layer of the heart that actually contracts.
    (this multiple choice question has been scrambled)
  8. Compared to skeletal muscle, cardiac muscle ________.
    A) has gap junctions that allow it to act as a functional syncytium
    B) has more nuclei per cell
    C) cells are larger than skeletal muscle cells
    D) lacks striations
    A) has gap junctions that allow it to act as a functional syncytium
    (this multiple choice question has been scrambled)
  9. During the period of ventricular filling ________.
    A) pressure in the heart is at its peak
    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) the atria remain in diastole
    C) blood flows passively through the atria and the open AV valves into the ventricles
    (this multiple choice question has been scrambled)
  10. The second heart sound is heard during which phase of the cardiac cycle?
    A) ventricular filling
    B) ventricular ejection
    C) isovolumetric contraction
    D) isovolumetric relaxation
    D) isovolumetric relaxation
    (this multiple choice question has been scrambled)
  11. The time of day most hazardous for heart attacks is ________.
    A) during sleep
    B) noontime
    C) morning
    D) evening
    C) morning
    (this multiple choice question has been scrambled)
  12. If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________.
    A) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle
    B) heart rate would decrease, but blood pressure would rise due to the excess sodium present
    C) threshold is reached more quickly and heart rate would increase
    D) potassium channels compensate and no change in heart rate would occur
    C) threshold is reached more quickly and heart rate would increase
    (this multiple choice question has been scrambled)
  13. Select the correct statement about cardiac output.
    A) Stroke volume increases if end diastolic volume decreases.
    B) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction.
    C) If a semilunar valve 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.
    B) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction.
    (this multiple choice question has been scrambled)
  14. During contraction of heart muscle cells ________.
    A) calcium is prevented from entering cardiac fibers that have been stimulated
    B) the action potential is initiated by voltage-gated slow calcium channels
    C) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
    D) the action potential is prevented from spreading from cell to cell by gap junctions
    C) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
    (this multiple choice question has been scrambled)
  15. Isovolumetric contraction ________.
    A) occurs immediately after the aortic and pulmonary valves close
    B) refers to the short period during ventricular systole when the ventricles are completely closed chambers
    C) occurs only in people with heart valve defects
    D) occurs while the AV valves are open
    B) refers to the short period during ventricular systole when the ventricles are completely closed chambers
    (this multiple choice question has been scrambled)
  16. Commotio cordis is heart failure due to a ________.
    A) relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when theheart is repolarizing
    B) loss of blood from an artery
    C) mild electrical shock to the heart itself
    D) severe electrical shock to the body
    A) relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when theheart is repolarizing
    (this multiple choice question has been scrambled)

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