#1
Which structure initiates the electrical impulse in the heart?
Sinoatrial (SA) node
Atrioventricular (AV) node
Purkinje fibers
Bundle of His
#2
What is the function of the atrioventricular (AV) node in the heart's conduction system?
To delay the impulse briefly before it travels to the ventricles
To generate the electrical impulse
To distribute the impulse to the Purkinje fibers
To contract the atria
#3
What is the normal resting heart rate, primarily set by the SA node?
60-80 beats per minute
100-120 beats per minute
40-60 beats per minute
80-100 beats per minute
#4
Which part of the heart's conduction system is responsible for transmitting the electrical signal from the atria to the ventricles?
Sinoatrial (SA) node
Atrioventricular (AV) node
Purkinje fibers
Bundle of His
#5
What is the role of the Purkinje fibers in the heart's conduction system?
To initiate the electrical impulse
To distribute the impulse rapidly throughout the ventricles
To delay the impulse before it reaches the ventricles
To contract the atria
#6
Which structure connects the atria to the ventricles and is responsible for transmitting the electrical impulse?
Sinoatrial (SA) node
Atrioventricular (AV) node
Purkinje fibers
Bundle of His
#7
Which of the following is NOT part of the intrinsic conduction system of the heart?
SA node
AV bundle (Bundle of His)
Pacemaker cells
Coronary arteries
#8
What is the sequence of electrical conduction through the heart?
SA node → AV node → Bundle of His → Purkinje fibers
AV node → SA node → Purkinje fibers → Bundle of His
Purkinje fibers → Bundle of His → SA node → AV node
Bundle of His → Purkinje fibers → SA node → AV node
#9
Which of the following is true regarding the Bundle of His?
It is located in the interatrial septum
It is responsible for delaying the impulse to allow the atria to contract fully
It branches into Purkinje fibers to distribute the impulse throughout the ventricles
It is also known as the atrioventricular (AV) node
#10
What happens if the SA node fails to function properly?
The heart rate will decrease
The AV node will take over as the primary pacemaker
The heart rate will increase
The heart will stop beating
#11
Which component of the intrinsic conduction system is also known as the pacemaker of the heart?
Sinoatrial (SA) node
Atrioventricular (AV) node
Bundle of His
Purkinje fibers
#12
What is the primary function of the atrioventricular (AV) node?
To generate the electrical impulse
To conduct the impulse from the SA node to the ventricles
To delay the impulse briefly before it is transmitted to the ventricles
To contract the ventricles
#13
Which part of the heart's conduction system is responsible for transmitting the impulse to the ventricles?
SA node
AV node
Bundle of His
Purkinje fibers
#14
What is the term for an abnormally fast heart rhythm (>100 beats per minute) originating from the SA node?
Sinus arrhythmia
Sinus bradycardia
Sinus tachycardia
Atrial fibrillation
#15
What effect does sympathetic stimulation have on the heart's conduction system?
Increases heart rate and conduction velocity
Decreases heart rate and conduction velocity
Has no effect on heart rate or conduction velocity
Stops the heart's electrical activity
#16
What is the name of the condition where there is a delay or interruption in the electrical impulses between the atria and ventricles?
Atrial fibrillation
Heart block
Sinus arrhythmia
Ventricular tachycardia
#17
Which of the following is a disorder characterized by a chaotic, irregular heartbeat due to rapid, uncoordinated electrical signals in the atria?
Atrial fibrillation
Ventricular fibrillation
Atrial flutter
Sinus bradycardia
#18
Which of the following is a condition characterized by an abnormally slow heart rate (<60 beats per minute) due to a malfunction in the SA node?
Sinus bradycardia
Sinus tachycardia
Atrial fibrillation
Atrial flutter