Understanding the Electrophysiology of the Heart Quiz

Left atrium receives oxygen-rich blood from the lungs.

Normal resting heart rate in adults is 60-80 beats per minute.

Electrocardiogram (ECG) is the measurement of the electrical activity of the heart over time, recorded as a graph.

Persistent coughing is NOT a common symptom of heart failure.

Myocardium is responsible for the muscular contractions that pump blood in the heart.

Sodium (Na+) is primarily responsible for the depolarization phase of the action potential in cardiac cells.

PR interval refers to the delay in electrical conduction at the atrioventricular (AV) node in the heart.

QRS complex represents ventricular depolarization in an ECG.

Refractory period is the period during which the cardiac muscle is unresponsive to further stimulation after depolarization.

Excitation-contraction coupling is the process by which electrical impulses spread through the heart muscle, leading to its contraction.

Sinoatrial (SA) node initiates the electrical impulse that regulates the heart rate.

Left circumflex artery supplies blood to the left atrium and posterior walls of the left ventricle.

Atrial fibrillation is characterized by a rapid and irregular heart rate originating from the atria.

Heart block is the condition where the heart's electrical impulses are blocked or delayed through the AV node.

Sodium channel blockers are commonly used to treat arrhythmias by blocking sodium channels and slowing electrical conduction in the heart.