#1
Which structure is responsible for initiating the heartbeat?
Sinoatrial (SA) node
ExplanationGenerates the heart's rhythm
#2
What is the function of the atrioventricular (AV) node in the heart's conduction system?
To delay the impulse to allow for atrial contraction before ventricular contraction
ExplanationDelays impulse for coordinated atrial and ventricular contraction
#3
Which part of the heart's conduction system is responsible for conducting electrical impulses from the atria to the ventricles?
Bundle of His
ExplanationConducts impulses from atria to ventricles
#4
During which phase of the cardiac cycle does the atrioventricular (AV) node delay the impulse?
Ventricular depolarization
ExplanationDelay during ventricular depolarization for coordinated contraction
#5
Which part of the heart's conduction system is responsible for coordinating the contraction of the ventricles?
Purkinje fibers
ExplanationCoordinates ventricular contraction
#6
During which phase of the cardiac cycle does ventricular repolarization occur?
T wave
ExplanationVentricular repolarization during T wave
#7
Which part of the heart's conduction system is known as the 'pacemaker'?
Sinoatrial (SA) node
ExplanationInitiates the heartbeat
#8
What happens if the atrioventricular (AV) node fails to function properly?
The impulse is blocked from reaching the ventricles
ExplanationImpulse blockage leading to ventricular dysfunction
#9
What is the significance of the delay caused by the atrioventricular (AV) node?
Allows time for the atria to contract before the ventricles
ExplanationFacilitates atrial contraction prior to ventricular contraction
#10
Which statement accurately describes the function of the Bundle of His?
Transmits electrical signals from the atria to the ventricles
ExplanationTransmission of electrical signals from atria to ventricles
#11
What happens if the Sinoatrial (SA) node fails to function properly?
The heart rate becomes irregular
ExplanationResults in an irregular heart rate
#12
Which statement accurately describes the function of the atrioventricular (AV) node?
Delays the impulse to allow for atrial contraction before ventricular contraction
ExplanationImpulse delay for coordinated atrial and ventricular contraction
#13
Which of the following statements about the Purkinje fibers is true?
They distribute electrical impulses rapidly throughout the ventricles
ExplanationRapid distribution of electrical impulses in the ventricles
#14
What effect would the malfunctioning of Purkinje fibers have on cardiac function?
Irregular heartbeat
ExplanationResults in an irregular heartbeat
#15
How do Purkinje fibers contribute to efficient heart function?
By distributing electrical impulses rapidly throughout the ventricles
ExplanationContribute to efficient ventricular contraction through rapid impulse distribution
#16
What would happen if the atrioventricular (AV) node fails to function properly?
The impulse is blocked from reaching the ventricles
ExplanationImpulse blockage leading to ventricular dysfunction
#17
What effect would the malfunctioning of the atrioventricular (AV) node have on cardiac function?
Irregular heartbeat
ExplanationResults in an irregular heartbeat