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Questions and Answers
What is responsible for coordinating the heartbeat in the heart?
What is responsible for coordinating the heartbeat in the heart?
- Intrinsic cardiac conduction system (correct)
- Network of contractile cells
- Autonomic nervous system
- Presence of gap junctions
What type of cells initiate and distribute impulses to coordinate depolarization and contraction of the heart?
What type of cells initiate and distribute impulses to coordinate depolarization and contraction of the heart?
- Noncontractile (autorhythmic) cells (correct)
- Red blood cells
- Neurons
- Contractile cells
What occurs during the depolarization phase of the action potential in pacemaker cells?
What occurs during the depolarization phase of the action potential in pacemaker cells?
- Closure of Ca2+ channels
- Efflux of K+ ions
- Influx of Ca2+ ions (correct)
- Opening of K+ channels
What is the function of the Sinoatrial (SA) node in the heart?
What is the function of the Sinoatrial (SA) node in the heart?
What leads to the repolarization phase in pacemaker cells?
What leads to the repolarization phase in pacemaker cells?
Which part of the action potential involves K+ channels being closed while slow Na+ channels are open?
Which part of the action potential involves K+ channels being closed while slow Na+ channels are open?
Which structure in the heart is responsible for generating impulses at approximately 75 beats per minute?
Which structure in the heart is responsible for generating impulses at approximately 75 beats per minute?
What is the inherent rate of the AV node in the absence of SA node input?
What is the inherent rate of the AV node in the absence of SA node input?
Which part of the heart serves as the only electrical connection between the atria and ventricles?
Which part of the heart serves as the only electrical connection between the atria and ventricles?
Defects in the intrinsic conduction system of the heart may lead to:
Defects in the intrinsic conduction system of the heart may lead to:
What does the process of defibrillation aim to achieve?
What does the process of defibrillation aim to achieve?
If an ectopic focus takes over pacing in the heart, what can be a consequence?
If an ectopic focus takes over pacing in the heart, what can be a consequence?
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