Ch 19 Heart test A

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eddardofwinter
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271722
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Ch 19 Heart test A
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2014-04-24 00:47:37
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  1. ____________ carry oxygen-poor blood.
    A. Pulmonary veins and pulmonary arteries
    B. Aorta and vena cavae
    C. Venae cavae and pulmonary arteries
    D. Aorta and pulmonary veins
    E. Pulmonary veins and vena cavae
    C. Venae cavae and pulmonary arteries
    (this multiple choice question has been scrambled)
  2. ______________ belong to the pulmonary circuit.
    A. Aorta and venae cavae
    B. Venae cavae and pulmonary veins
    C. Aorta and pulmonary veins
    D. Pulmonary arteries and pulmonary veins
    E. Pulmonary arteries and venae cavae
    D. Pulmonary arteries and pulmonary veins
    (this multiple choice question has been scrambled)
  3. _____________ is the most superficial layer enclosing the heart.
    A. Parietal pericardium
    B. Epicardium
    C. Visceral pericardium
    D. Myocardium
    E. Endocardium
    A. Parietal pericardium
    (this multiple choice question has been scrambled)
  4. Pericardial fluid is found between
    A. the parietal and visceral membranes.
    B. the visceral pericardium and the myocardium.
    C. epicardium and myocardium.
    D. myocardium and endocardium.
    E. the visceral pericardium and the epicardium.
    A. the parietal and visceral membranes.
    (this multiple choice question has been scrambled)
  5. The ________________ performs the work of the heart.
    A. epicardium
    B. endocardium
    C. myocardium
    D. fibrous skeleton
    E. pericardial cavity
    C. myocardium
    (this multiple choice question has been scrambled)
  6. The tricuspid valve regulates the opening between
    A. the right atrium and the left atrium.
    B. the right atrium and right ventricle.
    C. the right atrium and the left ventricle.
    D. the left atrium and the left ventricle.
    E. the left ventricle and the right ventricle.
    B. the right atrium and right ventricle.
    (this multiple choice question has been scrambled)
  7. Oxygen-poor blood passes through
    A. the right AV (tricuspid) valve only.
    B. the right AV (tricuspid) valve and pulmonary valve.
    C. the pulmonary and aortic valves.
    D. the left AV (bicuspid) valve and aortic valve.
    E. the left AV (bicuspid) valve only.
    B. the right AV (tricuspid) valve and pulmonary valve.
    (this multiple choice question has been scrambled)
  8. Opening and closing of the heart valves is caused by
    A. breathing.
    B. gravity.
    C. valves contracting and relaxing.
    D. osmotic gradients.
    E . pressure gradients.
    E . pressure gradients.
  9. After entering the right atrium, the furthest a red blood cell can travel is the
    A. pulmonary trunk.
    B. ascending aorta.
    C. right ventricle.
    D. superior vena cava.
    E. left atrium.
    D. superior vena cava.
    (this multiple choice question has been scrambled)
  10. Obstruction of the ___________ will cause a more severe myocardial infarction (MI) than the obstruction of any of the others.
    A. anterior interventricular branch
    B. posterior interventricular vein
    C. left coronary artery (LCA)
    D. left marginal vein
    E . circumflex branch
    C. left coronary artery (LCA)
    (this multiple choice question has been scrambled)
  11. Cardiac muscle shares this feature with skeletal muscle.
    A. cardiac muscle fibers have striations
    B. cardiac muscle fibers communicate by electrical (gap) junctions
    C. some cardiac muscle fibers are autorhythmic
    D. all cardiac muscle fibers depend on nervous stimulation
    E. cardiac muscle fibers are joined end to end by intercalated discs
    A. cardiac muscle fibers have striations
    (this multiple choice question has been scrambled)
  12. The ________________ is the pacemaker that initiates each heart beat.
    A. atrioventricular (AV) node
    B. autonomic nervous system
    C. cardiac conduction system
    D. sympathetic division of the nervous system
    E. sinoatrial (SA) node
    E. sinoatrial (SA) node
    (this multiple choice question has been scrambled)
  13. Which of these is not part of the cardiac conduction system?
    A. the tendinous cords (TC)
    B. the Purkinje fibers
    C. the atrioventricular (AV) node
    D. the atrioventricular (AV) bundle (bundle of His)
    E. the sinoatrial (SA) node
    A. the tendinous cords (TC)
    (this multiple choice question has been scrambled)
  14. These are features of cardiac muscle fibers except
    A. they have about the same endurance as skeletal muscle fibers.
    B. they have huge mitochondria.
    C. they are rich in glycogen.
    D. they are very rich in myoglobin.
    E. they depend almost exclusively on aerobic respiration.
    A. they have about the same endurance as skeletal muscle fibers.
    (this multiple choice question has been scrambled)
  15. This is the correct path of an electrical excitation from the pacemaker to a cardiocyte in the left ventricle (LV).
    A. atrioventricular (AV) node → Purkinje fibers → atrioventricular (AV) bundle → sinoatrial (SA) node → cardiocyte in LV
    B. sinoatrial (SA) node → atrioventricular (AV) node → atrioventricular (AV) bundle → Purkinje fibers → cardiocyte in LV
    C. sinoatrial (SA) node → atrioventricular (AV) node → Purkinje fibers → atrioventricular (AV) bundle → cardiocyte in LV
    D. atrioventricular (AV) node → sinoatrial (SA) node → atrioventricular (AV) bundle → Purkinje fibers → cardiocyte in LV
    E. sinoatrial (SA) node → atrioventricular (AV) bundle → atrioventricular (AV) node → Purkinje fibers → cardiocyte in LV
    B. sinoatrial (SA) node → atrioventricular (AV) node → atrioventricular (AV) bundle → Purkinje fibers → cardiocyte in LV
    (this multiple choice question has been scrambled)
  16. The pacemaker potential is a result of
    A. K+ inflow.
    B. Ca2+ inflow.
    C. K+ outflow.
    D. Na+ outflow.
    E. Na+ inflow.
    E. Na+ inflow.
    (this multiple choice question has been scrambled)
  17. Cells of the sinoatrial node ____________ during the pacemaker potential.
    A. depolarize slow
    B. repolarize slow
    C. repolarize fast
    D. depolarize slow and repolarize fast
    E. depolarize fast
    A. depolarize slow
    (this multiple choice question has been scrambled)
  18. Any abnormal cardiac rhythm is called a(n)
    A. heart block.
    B. arrhythmia.
    C. ectopic focus.
    D. sinus rhythm.
    E. nodal rhythm.
    B. arrhythmia.
    (this multiple choice question has been scrambled)
  19. If the sinoatrial (SA) is damaged, the heart will likely beat at
    A. 10 to 20 bpm.
    B. 40 to 50 bpm.
    C. 70 to 80 bpm.
    D. 20 to 40 bpm.
    E. less than 10 bpm.
    B. 40 to 50 bpm.
    (this multiple choice question has been scrambled)
  20. The _______________ provides most of the Ca2+ needed for myocardial contraction.
    A. mitochondria
    B. Golgi apparatus
    C. extracellular fluid
    D. sarcoplasmic reticulum
    E. cytoskeleton
    D. sarcoplasmic reticulum
    (this multiple choice question has been scrambled)

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