18. The Heart

Electrical Conduction System of the Heart

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In the electrical conduction system of the heart, which part of the ECG waveform represents ventricular depolarization?
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Which component of the electrical conduction system of the heart is most responsible for the synchronized contraction of cardiac muscle tissue?
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The AV node has fewer gap junctions than the SA node, leading to slower conduction. How does this slower conduction help the heart function?
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Which statement best describes intrinsic conduction of the heart?
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Which structure or structures are most directly responsible for allowing contraction of the ventricles to begin at the apex of the heart rather than in the septum closer to the AV node?
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The intrinsic conduction system ensures a coordinated and efficient heartbeat. If the sinoatrial (SA) node malfunctions, which part of the heart’s conduction system is most likely to take over as the pacemaker?
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Which statement best describes a difference between how the sympathetic and parasympathetic nervous system affects the heart?
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Which feature of cardiac tissue allows for the rapid spread of action potentials through the heart?
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Which of the following is a difference between cardiac muscle and skeletal muscle?
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The contractile cardiac muscle fibers of the myocardium behave as a single, coordinated unit called a __________.
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