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Questions and Answers
What is the first stage of the conduction system in the heart?
What is the term for heart contraction?
What is the second heart sound caused by?
What is the term for the events of one complete heartbeat?
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What is the result of plaque buildup in the arterial walls?
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What is the term for the heart's inability to pump efficiently?
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What is the term for a heart that stops beating due to malfunction?
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What is the term for the contraction of the ventricles?
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Study Notes
Conduction System
- The depolarization wave is initiated by the sinoatrial (SA) node.
- The wave then passes through the atrial myocardium.
- The depolarization wave then spreads to the atrioventricular (AV) node, causing the atria to contract.
- The wave rapidly passes through the AV bundle.
- The wave then continues on through the right and left bundle branches, and then to the Purkinje fibers in the ventricular walls, resulting in a contraction that ejects blood.
Cardiac Cycle
- The cardiac cycle refers to the events of one complete heartbeat, during which both atria and ventricles contract and then relax.
- Systole refers to heart contraction.
- Diastole refers to heart relaxation.
- The first heart sound, “lub”, is caused by the closing of the AV valves.
- The second heart sound, “dub”, occurs when the semilunar valves close at the end of systole.
ECG
- P wave: atria depolarize
- QRS complex: ventricles depolarize
- T wave: end of electrical activity in ventricles; repolarization of ventricular muscles
Heart Problems
Coronary Artery Disease
- Plaque buildup in the walls of the arteries may lead to a heart attack.
Heart Rhythm Problem
- Abnormal heart rhythm, including heartbeat that is too fast, too slow, or irregular.
Heart Valve Disease
- Degeneration of the aortic valve.
Heart Failure
- The heart fails to pump efficiently.
Cardiac Arrest
- The heart stops beating due to a malfunction.
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Description
This quiz covers the sequence of events in the conduction system of the heart, including the role of the SA node, atrial myocardium, AV node, AV bundle, and Purkinje fibers.
