#1
Which structure is responsible for initiating the heartbeat?
Purkinje fibers
Sinoatrial (SA) node
Atrioventricular (AV) node
Bundle of His
#2
What is the function of the atrioventricular (AV) node in the heart's conduction system?
To transmit electrical signals to the ventricles
To delay the impulse to allow for atrial contraction before ventricular contraction
To generate the heart's rhythm
To stimulate the atria to contract
#3
Which part of the heart's conduction system is responsible for conducting electrical impulses from the atria to the ventricles?
Sinoatrial (SA) node
Atrioventricular (AV) node
Purkinje fibers
Bundle of His
#4
During which phase of the cardiac cycle does the atrioventricular (AV) node delay the impulse?
Atrial depolarization
Atrial repolarization
Ventricular depolarization
Ventricular repolarization
#5
Which part of the heart's conduction system is responsible for coordinating the contraction of the ventricles?
Sinoatrial (SA) node
Atrioventricular (AV) node
Purkinje fibers
Bundle of His
#6
During which phase of the cardiac cycle does ventricular repolarization occur?
QRS complex
T wave
P wave
ST segment
#7
Which part of the heart's conduction system is known as the 'pacemaker'?
Bundle of His
Purkinje fibers
Sinoatrial (SA) node
Atrioventricular (AV) node
#8
What happens if the atrioventricular (AV) node fails to function properly?
The heart rate becomes irregular
The ventricles contract before the atria
The heart rate increases
The impulse is blocked from reaching the ventricles
#9
What is the significance of the delay caused by the atrioventricular (AV) node?
Allows time for the atria to contract before the ventricles
Ensures simultaneous contraction of atria and ventricles
Speeds up the heart rate
Coordinates the relaxation of atria and ventricles
#10
Which statement accurately describes the function of the Bundle of His?
Delays the impulse to allow for atrial contraction before ventricular contraction
Transmits electrical signals from the atria to the ventricles
Initiates the heartbeat
Coordinates the relaxation of the heart chambers
#11
What happens if the Sinoatrial (SA) node fails to function properly?
The heart rate decreases
The ventricles contract before the atria
The heart rate becomes irregular
The impulse is blocked from reaching the atria
#12
Which statement accurately describes the function of the atrioventricular (AV) node?
Coordinates the relaxation of the heart chambers
Initiates the heartbeat
Delays the impulse to allow for atrial contraction before ventricular contraction
Transmits electrical signals from the atria to the ventricles
#13
Which of the following statements about the Purkinje fibers is true?
They transmit electrical signals from the atria to the ventricles
They are located in the atrioventricular (AV) node
They are responsible for the delay between atrial and ventricular contractions
They distribute electrical impulses rapidly throughout the ventricles
#14
What effect would the malfunctioning of Purkinje fibers have on cardiac function?
Loss of atrial contraction
Irregular heartbeat
Delayed ventricular contraction
Slowed heart rate
#15
How do Purkinje fibers contribute to efficient heart function?
By delaying the transmission of impulses
By distributing electrical impulses rapidly throughout the ventricles
By generating the heart's rhythm
By transmitting impulses from the atria to the ventricles
#16
What would happen if the atrioventricular (AV) node fails to function properly?
The heart rate increases
The ventricles contract before the atria
The heart rate becomes irregular
The impulse is blocked from reaching the ventricles
#17
What effect would the malfunctioning of the atrioventricular (AV) node have on cardiac function?
Loss of atrial contraction
Irregular heartbeat
Delayed ventricular contraction
Slowed heart rate