WorksheetsCardiac Intrinsic Conduction System
Total questions: 20
Worksheet time: 10mins
If the P wave on an ECG looks abnormal, which structures in the heart are likely damaged?
SA/AV node
Aortic valve
Bundle of His
Purkyne fibers
The P-wave correlates with which event?
atrial depolarization
ventricle depolarization
ventricle repolarization
atrial repolarization
What does depolarization result in?
relaxation
contraction
repulsion
attraction
What is going on in the heart during the R-wave or QRS complex
SA node triggers depolarization in atria
AV node triggers depolarization in ventricles, the main pumping action
Delay caused by the SA node
Repolarization of the ventricles
What is going on in the heart during the T-wave
SA node triggers depolarization in atria
AV node triggers depolarization in ventricle, the main pumpung action
Delay caused by the SA node
Repolarization of the ventricles
Intrinsic electrical impulses start at which of the following locations?
AV Node
Bundle of His
Purkyne fibres
SA Node
Which of the following is most likely to occur if there is a blockage to the AV bundle nerve impulse?
the AV Node will not produce electrical impulses
the SA Node will not produce electrical impulses
no effect
the Purkyne fibres will not produce electrical impulses
The pacemaker of the heart is the
AV node
SA node
Bundle of His
Purkyne fibres
Which is the correct path of electrical impulses through the heart?
SA → Purkyne Fibres → Bundle Branches → AV
SA → AV → Bundle Branches → Purkyne Fibres
AV → SA → Bundle Branches → Purkyne Fibres
AV → Bundle Branches → SA → Purkyne Fibres
A cardiac cycle is:
ventricular relaxation
ventricular contraction
equivalent to 1 complete heart beat
a heart attack
What is the second step to heart contraction?
Atria contract
ventricles contract
depolarization of SA node
Impulse spreads throughout the atria
A heart rate 100 bpm or above is called _______.
bradycardia
tachycardia
arrhythmia
fibrillation
The smooth heart layer that keeps blood from sticking to the inside of the heart and forming potentially deadly blood clots is called
endocardium
pericardium
myocardium
epicardium
The SA node fires at a rate of
40-60 bpm
80-90 bpm
60-80 bpm
60-100 bpm
The branch of the autonomic nervous system causing the heart rate to slow during digestion, relaxation and sleep is the
sympathetic nervous system
parasympathetic nervous system
In this ECG, which unusual heart activity is the arrow indicating?
tachycardia
bradycardia
ectopic heart beat
ventricular fibrillation
