Basic Dysrhythmia Course Exam Guide
Questions with Correctly Analyzed Answers
Already Graded A+ 2026
SA node ANSWER >>> the major pacemaker of the heart
60-100 ANSWER >>> inherent rate of the SA node
40-60 ANSWER >>> inherent rate of the AV node
20-40 ANSWER >>> inherent rate of the ventricles (purkinjie fibers)
systole ANSWER >>> phase of contraction
diastole ANSWER >>> phase of relaxation
p wave ANSWER >>> what does atrial depolarization show on the ECG?
1
, QRS complex ANSWER >>> what does ventricle depolarization show on the ECG?
T wave ANSWER >>> what does repolarization show on the ECG?
increase ANSWER >>> what does sympathetic stimulation do to the heart rate?
decrease ANSWER >>> what does parasympathetic stimulation do to the heart rate?
absolute refractory period ANSWER >>> the period immediately following the firing of a
nerve fiber when it cannot be stimulated no matter how great a stimulus is applied
relative refractory period ANSWER >>> during the ventricular cardiac cycle when all
cardiac cells are not fully repolarized and a strong enough stimulus can excite cardiac
tissue and initiate arrhythmias
last half of t wave ANSWER >>> When is the relative refractory period of the ventricles?
.20 secs ANSWER >>> how much time is one large box in an ecg strip?
.04 secs ANSWER >>> how much time is one small box in an ecg strip?
0.12-0.20 ANSWER >>> normal range of PR interval
0.04-0.12 ANSWER >>> normal range of QRS complex
less than 1/2 the preceding R-R interval ANSWER >>> what is the normal time of the
QT?
p to p ANSWER >>> how do you measure the atrial rate?
2
Questions with Correctly Analyzed Answers
Already Graded A+ 2026
SA node ANSWER >>> the major pacemaker of the heart
60-100 ANSWER >>> inherent rate of the SA node
40-60 ANSWER >>> inherent rate of the AV node
20-40 ANSWER >>> inherent rate of the ventricles (purkinjie fibers)
systole ANSWER >>> phase of contraction
diastole ANSWER >>> phase of relaxation
p wave ANSWER >>> what does atrial depolarization show on the ECG?
1
, QRS complex ANSWER >>> what does ventricle depolarization show on the ECG?
T wave ANSWER >>> what does repolarization show on the ECG?
increase ANSWER >>> what does sympathetic stimulation do to the heart rate?
decrease ANSWER >>> what does parasympathetic stimulation do to the heart rate?
absolute refractory period ANSWER >>> the period immediately following the firing of a
nerve fiber when it cannot be stimulated no matter how great a stimulus is applied
relative refractory period ANSWER >>> during the ventricular cardiac cycle when all
cardiac cells are not fully repolarized and a strong enough stimulus can excite cardiac
tissue and initiate arrhythmias
last half of t wave ANSWER >>> When is the relative refractory period of the ventricles?
.20 secs ANSWER >>> how much time is one large box in an ecg strip?
.04 secs ANSWER >>> how much time is one small box in an ecg strip?
0.12-0.20 ANSWER >>> normal range of PR interval
0.04-0.12 ANSWER >>> normal range of QRS complex
less than 1/2 the preceding R-R interval ANSWER >>> what is the normal time of the
QT?
p to p ANSWER >>> how do you measure the atrial rate?
2
