Cardiac Conduction System Quiz

The SA Node initiates the heartbeat by generating electrical impulses.

The cardiac conduction system generates and transmits electrical impulses to coordinate the heart's rhythm.

The pulmonary valve is not part of the cardiac conduction system; it regulates blood flow from the right ventricle to the pulmonary artery.

Bradycardia refers to a heart rate below the normal range, typically less than 60 beats per minute.

The AV Node is situated between the atria and ventricles, serving as a gateway for electrical impulses.

The SA Node typically generates electrical impulses at a rate of 60-100 beats per minute at rest.

Purkinje fibers relay electrical impulses rapidly to the ventricles, ensuring coordinated ventricular contraction.

Arrhythmia refers to abnormal heart rhythms resulting from disturbances in the cardiac conduction system.

Sodium ions are essential for depolarization (cell excitation) and repolarization (cell recovery) in cardiac muscle cells.

The AV Node delays electrical impulses, ensuring proper timing for atrial contraction prior to ventricular contraction.

The AV Node is most vulnerable to damage in patients with heart block, leading to conduction abnormalities.

AV delay refers to the short pause at the AV Node, ensuring sequential contraction of the atria and ventricles.

Phase 0 of the cardiac action potential involves rapid depolarization, marking the initiation of cell contraction.

First-degree heart block is characterized by a prolonged PR interval on an ECG, signifying delayed conduction at the AV Node.