What is the primary function of an electrocardiogram (EKG)?

• To monitor brain waves

• To record the electrical activity of the heart

• To assess lung function

• To measure blood pressure

Which part of the heart's electrical system initiates the heartbeat?

• AV node

• Purkinje fibers

• SA node

• Bundle of His

What does the P wave on an EKG represent?

• Ventricular repolarization

• Atrial repolarization

• Ventricular depolarization

• Atrial depolarization

Why is the QRS complex larger than the P wave on an EKG?

• The atria are larger than the ventricles

• The ventricles are closer to the electrodes

• The ventricles have more muscle mass than the atria

• The atria contract more forcefully than the ventricles

What does the T wave on an EKG indicate?

• Ventricular repolarization

• Atrial depolarization

• Ventricular depolarization

• Atrial repolarization