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If the AV node is damaged so that it can no longer transmit the signal from the SA node (total heart block) , will the ventricles continue to contract? Why or why not?


A) Yes: the AV bundle will keep the heart going at the usual rate.
B) Yes: however, ventricular contractions will no longer follow atrial contractions, and the rate of ventricular contractions will be significantly slowed.
C) No: there are no cells left to pace and coordinate the heart beat.
D) No: the SA node must be intact to pace the system.

Correct Answer

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In sequential order, the components of the intrinsic conduction system, beginning at the SA node, are_________ .


A) subendocardial conducting network (Purkinje fibers) , bundle branches, AV bundle, AV node
B) AV node, AV bundle, bundle branches, subendocardial conducting network (Purkinje fibers)
C) AV bundle, AV node, subendocardial conducting network (Purkinje fibers) , bundle branches
D) bundle branches, AV node, AV bundle, subendocardial conducting network (Purkinje fibers)

Correct Answer

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This portion of the ECG is associated with ventricular contraction.


A) S- T segment
B) QRS complex
C) Q- T interval
D) P- R interval

Correct Answer

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A normal Q- T interval is_________ .


A) 0.32- 0.38 sec when heart rate is 70 beats/min
B) 1.0- 2.0 sec when heart rate is 80 beats/min
C) 0.16- 0.18 sec when the heart rate is 60 beats/min
D) 0.08 sec when the heart rate is 50 beats/min

Correct Answer

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A

The electrocardiogram (ECG) shows a record of .


A) electrical activity of the heart muscle
B) the electrical events in the intrinsic conduction system
C) each heart beat (or contraction)

Correct Answer

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The middle and largest deflection wave in a normal ECG is the_________ .


A) T wave
B) P wave
C) QRS complex

Correct Answer

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A health care provider who suspects that a patient is having a heart attack will look very carefully at this portion of the ECG.


A) Q- T interval
B) P- R interval
C) S- T segment
D) QRS complex

Correct Answer

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Bradycardia describes a heart rate of_________ .


A) less than 60 beats/min
B) 60- 80 beats/min
C) 80- 100 beats/min
D) over 100 beats/min

Correct Answer

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Ventricular fibrillation is __________ _.


A) slow, strong ventricular contractions
B) rapid, uncoordinated ventricular contractions
C) fluttering of the atria
D) strong, rhythmic atrial contractions

Correct Answer

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B

The T wave of the ECG represents_________ .


A) repolarization of the ventricles
B) repolarization of the atria
C) repolarization of the intrinsic conduction system

Correct Answer

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The function of the intrinsic conduction system is to_________ .


A) contract slightly before the cardiac tissue to which it is connected
B) carry branches of the autonomic nervous system to heart muscle
C) ensure that the heart beats in a sequential and coordinated manner
D) maintain the structural integrity of the atria and ventricles

Correct Answer

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The QRS complex is associated with _________.


A) depolarization of the atria
B) repolarization of the ventricles
C) depolarization of the ventricles
D) depolarization of the ventricular septum

Correct Answer

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In the normal heart, the _________has the highest rate of discharge and sets the rate of depolarization for the heart as a whole.


A) bundle branches
B) AV node
C) AV bundle
D) SA node

Correct Answer

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It the interval between R waves is on an ECG is 0.80 sec, then the heart rate is _________.


A) 80 beats/min
B) 70 beats/min
C) 75 beats/min
D) 65 beats/min

Correct Answer

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How does holding the breath affect heart rate?


A) heart rate decreases
B) heart rate is unaffected by breath holding
C) heart rate increases

Correct Answer

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During exercise, the heart rate _________.


A) increases to a set "exercise rate"
B) decreases in inverse relation to the exertion involved
C) increases proportional to the exertion involved
D) decreases slightly, but the contractions are stronger

Correct Answer

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C

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