Mastering The Cardiac Conduction System And ECG Interpretation

The video explains the cardiac conduction system, detailing the roles of the sinoatrial (SA) node, atrioventricular (AV) node, AV bundle, and Purkinje fibers in heart rhythm regulation. It covers how electrical impulses travel through the heart, causing atrial and ventricular contractions. The video also introduces the electrocardiogram (ECG), describing its components like the P wave, QRS complex, and T wave, which represent different phases of the cardiac cycle.

What is the primary function of the sinoatrial node (SA node) in the heart?

• To record the heart's electrical activity

• To conduct impulses to the Purkinje fibers

• To act as the heart's natural pacemaker

• To delay electrical impulses to the ventricles

Where is the atrioventricular node (AV node) located?

• In the interventricular septum

• In the right atrium near the AV valve

• At the apex of the heart

• In the left atrium near the pulmonary veins

What is the role of the atrioventricular bundle in the cardiac conduction system?

• To record the heart's electrical activity

• To conduct impulses toward the apex of the heart

• To delay impulses to the ventricles

• To initiate the heartbeat

What does the P wave on an ECG represent?

• Atrial depolarization

• Ventricular repolarization

• Ventricular depolarization

• Atrial repolarization

What does the P-Q segment on an ECG indicate?

• The time for atrial repolarization

• The time for ventricular repolarization

• The time for ventricular depolarization

• The time for signals to travel from the SA node to the AV node

Which wave on the ECG corresponds to the depolarization of the interventricular septum?

• S wave

• Q wave

• R wave

• P wave

What is obscured by the QRS complex on an ECG?

• Ventricular depolarization

• Atrial depolarization

• Ventricular repolarization

• Atrial repolarization

What does the S-T segment on an ECG reflect?

• The repolarization of the atria

• The initiation of the heartbeat

• The plateau in the myocardial action potential

• The delay of impulses to the ventricles

What does the T wave on an ECG represent?

• Atrial depolarization

• Ventricular depolarization

• Ventricular repolarization

• Atrial repolarization

What happens immediately before ventricular relaxation?

• Ventricular repolarization

• Atrial depolarization

• Atrial repolarization

• Ventricular depolarization