12 Questions
What is the role of the sinoatrial (SA) node in the heart?
Controls the contraction of the atria
Why does the right side of the heart contract slightly sooner than the left side?
Due to asynchronous contraction caused by nerve impulse transmission
What is the function of an electrocardiogram (ECG)?
To represent a composite record of the heart’s electrical events
What is essential for a valid ECG tracing?
Proper electrode placement
Which part of the heart initiates the electrical impulse that spreads across the atria?
Sinoatrial (SA) node
What is the purpose of cardiac conduction in controlling heart muscle activity?
To regulate rhythmic contraction and dilation of heart muscle
What is the function of the right and left crus in the heart?
To facilitate the spread of impulse into the ventricles
Which part of the heart is primarily responsible for the depolarization of the atria before contraction?
Sinoatrial node (SA)
What does the QRS complex in an ECG signal?
Ventricular depolarization
What does a T-wave represent in an ECG waveform?
Ventricular repolarization during ventricular diastole
In a normal ECG phase, when do the ventricles contract?
After the QRS complex
What can large low spaces on an ECG graph indicate about the heart's function?
Heart block causing lack of contraction signals
Test your knowledge on the intrinsic regulation of heart rate, the role of the Sinoatrial (SA) node, and the normal route of myocardial impulse transmission. Learn about cardiac muscle rhythm, the heart's pacemaker, and the basics of Electrocardiogram (ECG).
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