18. The Heart

Which instrument is primarily used to record the electrical activity of the heart during an electrocardiogram (ECG)?

Which ECG feature corresponds to the contraction of the ventricles?

Which wave on the electrocardiogram (ECG) represents ventricular depolarization?

During which part of the ECG are the atria depolarizing?

Which wave of the ECG cycle represents atrial depolarization?

Which of the following is the part of the ECG wave that represents ventricular contraction?

Which of the following components of an ECG represents atrial depolarization?

Which ECG component corresponds to the time it takes for the ventricles to contract?

Which component of the ECG represents the depolarization of the ventricles?

The QRS wave of an ECG represents which event in the cardiac cycle?

Which of the following ECG components represents a lack of electrical activity?

What does the ECG wave tracing represent?

Which ECG component corresponds to the depolarization of the atria?

Which electrocardiogram (ECG) finding can be used to measure heart rate?