Electrical Conduction System of the Heart Quiz

What is the primary function of the SA node in the heart?

• To contract the ventricles

• To prevent blood flow between atria and ventricles

• To act as the heart's pacemaker

• To delay impulses to the ventricles

Why is the AV node referred to as the 'gatekeeper'?

• It initiates atrial contraction

• It prevents blood from flowing back into the atria

• It delays impulses to allow atria to empty

• It speeds up the heart rate

What occurs during ventricular depolarization?

• Atrial relaxation

• Ventricular relaxation

• Ventricular contraction

• Atrial contraction

What does a normal PQRST complex on an EKG indicate?

• Ventricular fibrillation

• Heart block

• Normal sinus rhythm

• Atrial flutter

What might result from a malfunction in the heart's electrical conduction system?

• Normal sinus rhythm

• Atrial flutter

• Increased heart rate

• Decreased blood pressure