Podcast
Questions and Answers
What is the primary function of the heart?
What is the primary function of the heart?
- To pump oxygenated and deoxygenated blood (correct)
- To produce red blood cells
- To regulate body temperature
- To filter waste products from the blood
Which heart chamber receives blood from the body?
Which heart chamber receives blood from the body?
- Aorta
- Atria (correct)
- Ventricles
- Pulmonary Artery
What is the main role of the ventricles?
What is the main role of the ventricles?
- To pump blood to the lungs and systemic circulation (correct)
- To receive blood from the lungs
- To filter blood before it enters the heart
- To regulate heart rate
What part of the heart's electrical system acts as the primary pacemaker?
What part of the heart's electrical system acts as the primary pacemaker?
What best describes the role of the AV node?
What best describes the role of the AV node?
Which of the following conducts impulses from the AV node to the ventricles?
Which of the following conducts impulses from the AV node to the ventricles?
Which of the following carries impulses to the Purkinje fibers?
Which of the following carries impulses to the Purkinje fibers?
Which of the following stimulates ventricular contraction?
Which of the following stimulates ventricular contraction?
What does the P wave represent on an ECG?
What does the P wave represent on an ECG?
What does the QRS complex represent on an ECG?
What does the QRS complex represent on an ECG?
Which of the following can cause arrhythmias?
Which of the following can cause arrhythmias?
What effect does sympathetic stimulation have on heart rate?
What effect does sympathetic stimulation have on heart rate?
Bradycardias can lead to which of the following?
Bradycardias can lead to which of the following?
Tachycardias can cause what?
Tachycardias can cause what?
What can fibrillation lead to?
What can fibrillation lead to?
What does ST elevation indicate?
What does ST elevation indicate?
What does ST depression indicate?
What does ST depression indicate?
What is a pacemaker?
What is a pacemaker?
Pacemakers are used for which of the following conditions?
Pacemakers are used for which of the following conditions?
Flashcards
The Heart
The Heart
Muscular organ pumping oxygenated and deoxygenated blood.
Atria
Atria
Receives blood returning to the heart.
Ventricles
Ventricles
Pumps blood out to the lungs/body.
Heart's Electrical System
Heart's Electrical System
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Sinoatrial (SA) Node
Sinoatrial (SA) Node
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Atrioventricular (AV) Node
Atrioventricular (AV) Node
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Bundle of His
Bundle of His
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Right & Left Bundle Branches
Right & Left Bundle Branches
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Purkinje Fibers
Purkinje Fibers
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P Wave
P Wave
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PR Interval
PR Interval
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QRS Complex
QRS Complex
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T Wave
T Wave
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Hypoxia
Hypoxia
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Electrolyte Imbalances
Electrolyte Imbalances
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Ischemia & Myocardial Infarction
Ischemia & Myocardial Infarction
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Autonomic Nervous System Influence
Autonomic Nervous System Influence
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Pacemaker
Pacemaker
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Failure to Capture
Failure to Capture
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Failure to Sense
Failure to Sense
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Study Notes
- The heart is a muscular organ responsible for pumping oxygenated and deoxygenated blood through the circulatory system
- The heart consists of four chambers
Atria
- Right and left atria receive blood
Ventricles
- Right and left ventricles pump blood
- The right ventricle pumps blood to the lungs
- The left ventricle pumps blood to the systemic circulation
Electrical Conduction System
- The heart’s electrical system controls rhythmic contractions
- The sinoatrial (SA) node is the primary pacemaker (60-100 bpm)
- The atrioventricular (AV) node is a backup pacemaker (40-60 bpm)
- The Bundle of His conducts impulses from the AV node to the ventricles
- The right and left bundle branches carry impulses to Purkinje fibers
- Purkinje fibers stimulate ventricular contraction (20-40 bpm if acting as pacemaker)
Cardiac Cycle & ECG Phases
- P Wave represents atrial depolarization
- PR interval is the time from atrial depolarization to ventricular depolarization (0.12-0.20 sec)
- QRS Complex represents ventricular depolarization (<0.12 sec)
- T Wave represents ventricular repolarization
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