Podcast
Questions and Answers
What is the role of the sinoatrial (SA) node in the heart?
What is the role of the sinoatrial (SA) node in the heart?
- Creates the electrical field throughout the body
- Regulates the heart rate during physical activity
- Controls the contraction of the atria (correct)
- Controls the contraction of the ventricles
Why does the right side of the heart contract slightly sooner than the left side?
Why does the right side of the heart contract slightly sooner than the left side?
- Due to differences in blood pressure in the right and left sides
- Due to asynchronous contraction caused by nerve impulse transmission (correct)
- Because of genetic differences between the right and left sides
- Because of variations in hormone levels
What is the function of an electrocardiogram (ECG)?
What is the function of an electrocardiogram (ECG)?
- To measure oxygen levels in the blood
- To monitor lung function
- To control the heart's pumping rate
- To represent a composite record of the heart’s electrical events (correct)
What is essential for a valid ECG tracing?
What is essential for a valid ECG tracing?
Which part of the heart initiates the electrical impulse that spreads across the atria?
Which part of the heart initiates the electrical impulse that spreads across the atria?
What is the purpose of cardiac conduction in controlling heart muscle activity?
What is the purpose of cardiac conduction in controlling heart muscle activity?
What is the function of the right and left crus in the heart?
What is the function of the right and left crus in the heart?
Which part of the heart is primarily responsible for the depolarization of the atria before contraction?
Which part of the heart is primarily responsible for the depolarization of the atria before contraction?
What does the QRS complex in an ECG signal?
What does the QRS complex in an ECG signal?
What does a T-wave represent in an ECG waveform?
What does a T-wave represent in an ECG waveform?
In a normal ECG phase, when do the ventricles contract?
In a normal ECG phase, when do the ventricles contract?
What can large low spaces on an ECG graph indicate about the heart's function?
What can large low spaces on an ECG graph indicate about the heart's function?
