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Chapter 18 Part B: The Cardiovascular System - Electrical Events of the Heart

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Chapter 18 Part B: The Cardiovascular System - Electrical Events of the Heart

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Questions and Answers

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?

Noncontractile (autorhythmic) cells (correct)

Red blood cells

Neurons

Contractile 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?

Initiates the action potential Signup and view all the answers

What leads to the repolarization phase in pacemaker cells?

Efflux of K+ ions Signup and view all the answers

Which part of the action potential involves K+ channels being closed while slow Na+ channels are open?

Pacemaker potential Signup and view all the answers

Which structure in the heart is responsible for generating impulses at approximately 75 beats per minute?

SA node Signup and view all the answers

What is the inherent rate of the AV node in the absence of SA node input?

50 beats per minute Signup and view all the answers

Which part of the heart serves as the only electrical connection between the atria and ventricles?

AV bundle Signup and view all the answers

Defects in the intrinsic conduction system of the heart may lead to:

Uncoordinated atrial and ventricular contractions Signup and view all the answers

What does the process of defibrillation aim to achieve?

Interrupt rapid, irregular heart contractions Signup and view all the answers

If an ectopic focus takes over pacing in the heart, what can be a consequence?

Uncoordinated contractions Signup and view all the answers