Block 3 Cardio Physio BRS

44 Questions | Total Attempts: 428

SettingsSettingsSettings
Please wait...
Block 3 Cardio Physio BRS

.


Questions and Answers
  • 1. 
    Arteriography of a patient's left renal arteryshows narrowing of the radius of the artery by 50%. What is the expected change in blood flowthrough the stenotic artery?
    • A. 

      Decrease to 1/2

    • B. 

      Decrease to 1/4

    • C. 

      Decrease to 1/8

    • D. 

      Decrease to 1/16

    • E. 

      No change

  • 2. 
    When a person moves from a supine position to a standing position, which of the following compensatory changes occurs?
    • A. 

      Decreased heart rate

    • B. 

      Increased contractility

    • C. 

      Decreased total peripheral resistance (TPR)

    • D. 

      Decreased cardiac output

    • E. 

      Increased PR intervals

  • 3. 
    At which site is systolic blood pressure the highest?
    • A. 

      Aorta

    • B. 

      Central vein

    • C. 

      Pulmonary artery

    • D. 

      Right atrium

    • E. 

      Renal artery

    • F. 

      Renal vein

  • 4. 
    A person's electrocardiogram (ECG) has no P wave, but has a normal QRS complex and a normal T wave. Therefore, his pacemaker is located in the
    • A. 

      Sinoatrial (SA) node

    • B. 

      Atrioventricular (AV) node

    • C. 

      Bundle of His

    • D. 

      Purkinje system

    • E. 

      Ventricular muscle

  • 5. 
    If the ejection fraction increases, there will be a decrease in
    • A. 

      Cardiac output

    • B. 

      End-diastolic volume

    • C. 

      End-systolic volume

    • D. 

      Heart rate

    • E. 

      Pulse pressure

    • F. 

      Stroke volume

    • G. 

      Systolic pressure

  • 6. 
    An electrocardiogram (ECG) on a person shows ventricular extrasystoles. The extrasystolic beat would produce
    • A. 

      Increased pulse pressure because contractility is increased

    • B. 

      Increased pulse pressure because heart rate is increased

    • C. 

      Decreased pulse pressure because ventricular filling time is increased

    • D. 

      Decreased pulse pressure because stroke volume is decreased

    • E. 

      Decreased pulse pressure because the PR interval is increased

  • 7. 
    An electrocardiogram (ECG) on a person shows ventricular extrasystoles. The next "normal" ventricular contraction that occurs after the extrasystole would produce
    • A. 

      Increased pulse pressure because the contractility of the ventricle is increased

    • B. 

      Increased pulse pressure because total peripheral resistance (TPR) is decreased

    • C. 

      Increased pulse pressure because compliance of the veins is decreased

    • D. 

      Decreased pulse pressure because the contractility of the ventricle is increased

    • E. 

      Decreased pulse pressure because TPR is decreased

  • 8. 
    An increase in contractility is demonstrated on a Frank-Starling diagram by
    • A. 

      Increased cardiac output for a given enddiastolic volume

    • B. 

      Increased cardiac output for a given endsystolic volume

    • C. 

      Decreased cardiac output for a given enddiastolic volume

    • D. 

      Decreased cardiac output for a given endsystolic Volume

  • 9. 
    The tendency for blood flow to be turbulent is increased by
    • A. 

      Increased viscosity

    • B. 

      Increased hematocrit

    • C. 

      Partial occlusion of a blood vessel

    • D. 

      Decreased velocity of blood flow

  • 10. 
    A patient experiences orthostatic hypotension after a sympathectomy. The explanation for this occurrence is
    • A. 

      An exaggerated response of the reninangiotensin- aldosterone system

    • B. 

      A suppressed response of the renin-angiotensin- aldosterone system

    • C. 

      An exaggerated response of the baroreceptor mechanism

    • D. 

      A suppressed response of the baroreceptor mechanism

  • 11. 
    The ventricles are completely depolarized during which isoelectric portion of the electrocardiogram (ECG)?
    • A. 

      PR interval

    • B. 

      QRS complex

    • C. 

      QT interval

    • D. 

      ST segment

    • E. 

      T wave

  • 12. 
    In which of the following situations is pulmonary blood flow greater than aortic blood flow?
    • A. 

      Normal adult

    • B. 

      Fetus

    • C. 

      Left-to-right ventricular shunt

    • D. 

      Right-to-left ventricular shunt

    • E. 

      Right ventricular failure

    • F. 

      Administration of a positive inotropic

  • 13. 
    A person's electrocardiogram (ECG) shows two P waves preceding each QRS complex. The interpretation of this pattern is
    • A. 

      Decreased firing rate of the pacemaker in the sinoatrial (SA) node

    • B. 

      Decreased firing rate of the pacemaker in the atrioventricular (AV) node

    • C. 

      Increased firing rate of the pacemaker in the SA node

    • D. 

      Decreased conduction through the AV node

    • E. 

      Increased conduction through the His- Purkinje system

  • 14. 
    An acute decrease in arterial blood pressure elicits which of the following compensatory changes?
    • A. 

      Decreased firing rate of the carotid sinus nerve

    • B. 

      Increased parasympathetic outflow to the heart

    • C. 

      Decreased heart rate

    • D. 

      Decreased contractility

    • E. 

      Decreased mean systemic pressure

  • 15. 
    The tendency for edema to occur will be increased by
    • A. 

      Arteriolar constriction

    • B. 

      Increased venous pressure

    • C. 

      Increased plasma protein concentration

    • D. 

      Muscular activity

  • 16. 
    Inspiration "splits" the second heart sound because
    • A. 

      The aortic valve closes before the pulmonic valve

    • B. 

      The pulmonic valve closes before the aortic valve

    • C. 

      The mitral valve closes before the tricuspid valve

    • D. 

      The tricuspid valve closes before the mitral valve

    • E. 

      Filling of the ventricles has fast and slow components

  • 17. 
    During exercise, total peripheral resistance (TPR) decreases because of the effect of
    • A. 

      the sympathetic nervous system on splanchnic arterioles

    • B. 

      The parasympathetic nervous system on skeletal muscle arterioles

    • C. 

      Local metabolites on skeletal muscle arterioles

    • D. 

      Local metabolites on cerebral arterioles

    • E. 

      Histamine on skeletal muscle arterioles

  • 18. 
    An increase in arteriolar resistance, without a change in any other component of the cardiovascular system, will produce
    • A. 

      A decrease in total peripheral resistance (TPR)

    • B. 

      An increase in capillary filtration

    • C. 

      An increase in arterial pressure

    • D. 

      A decrease in afterload

  • 19. 
    The following measurements were obtained in a male patient: Heart rate: 70 beats/min Pulmonary vein [0 2] = 0.24 ml 02/m1 Pulmonary artery [02] = 0.16 ml 02/ml Whole body 02 consumption: 500 ml/min What is this patient's cardiac output?
    • A. 

      1.65 L/min

    • B. 

      4.55 L/min

    • C. 

      5.00 L/min

    • D. 

      6.25 L/min

    • E. 

      8.00 L/min

  • 20. 
    Which of the following is the result of an inward Na+ current?
    • A. 

      Upstroke of the action potential in the sinoatrial (SA) node

    • B. 

      Upstroke of the action potential in Purkinje fibers

    • C. 

      Plateau of the action potential in ventricular muscle

    • D. 

      Repolarization of the action potential in ventricular muscle

    • E. 

      Repolarization of the action potential in the SA node

  • 21. 
    The greatest pressure decrease in the circulation occurs across the arterioles because
    • A. 

      They have the greatest surface area

    • B. 

      They have the greatest cross-sectional area

    • C. 

      The velocity of blood flow through them is the highest

    • D. 

      The velocity of blood flow through them is the lowest

    • E. 

      They have the greatest resistance

  • 22. 
    Pulse pressure is
    • A. 

      The highest pressure measured in the arteries

    • B. 

      The lowest pressure measured in the arteries

    • C. 

      Measured only during diastole

    • D. 

      Determined by stroke volume

    • E. 

      Decreased when the capacitance of the arteries decreases

    • F. 

      The difference between mean arterial pressure and central venous pressure

  • 23. 
    In the sinoatrial (SA) node, phase 4 depolarization (pacemaker potential) is attributable to
    • A. 

      An increase in K + conductance

    • B. 

      An increase in Na + conductance

    • C. 

      A decrease in Cl- conductance

    • D. 

      A decrease in Ca2+ conductance

    • E. 

      Simultaneous increases in K + and Cl conductances

  • 24. 
    Which receptor mediates constriction of arteriolar smooth muscle?
    • A. 

      A1 Receptors

    • B. 

      B1 Receptors

    • C. 

      B2 receptors

    • D. 

      Muscarinic receptors

  • 25. 
    During which phase of the cardiac cycle is aortic pressure highest?
    • A. 

      Atrial systole

    • B. 

      Isovolumetric ventricular contraction

    • C. 

      Rapid ventricular ejection

    • D. 

      Reduced (slow) ventricular ejection

    • E. 

      Isovolumetric ventricular relaxation

    • F. 

      Rapid ventricular filling

    • G. 

      Reduced (slow) ventricular filling (diastasis)

Related Topics
Back to Top Back to top