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HereIam HereIam
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6 years ago
What is the normal period of time for the PR interval?
 
  a. Not longer than 0.20 sec
  b. Not longer than 0.30 sec
  c. Not longer than 0.45 sec
  d. Not longer than 0.50 sec


Q. 2  Which of the following waves represents repolarization of the ventricles?
 
  a. P wave
  b. QRS wave
  c. T wave
  d. U wave


Q. 3  What is the width of the normal QRS complex?
 
  a. Not wider than 1 mm
  b. Not wider than 3 mm
  c. Not wider than 5 mm
  d. Not wider than 7 mm


Q. 4  Which of the following waves represents depolarization of the ventricles?
 
  a. P wave
  b. QRS wave
  c. T wave
  d. U wave


Q. 5  What is the normal maximum length of the P wave?
 
  a. 1 mm
  b. 3 mm
  c. 5 mm
  d. 7 mm


Q. 6  What term is used to define the ability of certain cardiac cells to depolarize without stimulation?
 
  a. Automaticity
  b. Polarization
  c. Contraction
  d. Autopolarization
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#1
6 years ago
(Answer to Q. 1)  ANS: A
Normally, the PR interval represents a period no longer than 0.20 sec.

(Answer to Q. 2)  ANS: C
The wave of repolarization occurring in the ventricles immediately after depolarization is the T wave.

(Answer to Q. 3)  ANS: B
The normal QRS complex is not wider than 3 mm (0.12 sec) because of the rapid movement of the impulse through the ventricles by the bundle branches and Purkinje fibers.

(Answer to Q. 4)  ANS: B
The wave of depolarization occurring over the ventricles is seen as the QRS complex on the ECG tracing.

(Answer to Q. 5)  ANS: B
Atrial hypertrophy may cause the P wave to enlarge to a height and length beyond the normal parameters.

(Answer to Q. 6)  ANS: A
The ability of these cells to depolarize without stimulations is known as automaticity.
HereIam Author
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#2
6 years ago
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