CRAT Cardiac Anatomy and Physiology 2

Question 1

Which structure is the primary pacemaker of the heart under normal conditions?

Accepted Answer

Sinoatrial (SA) node

Answer

Atrioventricular (AV) node

Answer

Bundle of His

Answer

Purkinje fibers

Question 2

What is the intrinsic firing rate of the AV node if it serves as the escape pacemaker?

Accepted Answer

40-60 bpm

Answer

60-100 bpm

Answer

20-40 bpm

Answer

100-150 bpm

Question 3

During ventricular depolarization, which ECG component is produced?

Accepted Answer

QRS complex

Answer

P wave

Answer

T wave

Answer

U wave

Question 4

The refractory period of the AV node serves which primary function?

Accepted Answer

Limiting ventricular rate during rapid atrial arrhythmias

Answer

Initiating spontaneous depolarization

Answer

Conducting impulses faster to the ventricles

Answer

Generating the P wave

Question 5

Which coronary artery most commonly supplies the SA node?

Accepted Answer

Right coronary artery (RCA)

Answer

Left anterior descending artery (LAD)

Answer

Left circumflex artery

Answer

Left main coronary artery

Question 6

The T wave on the ECG represents which electrophysiological event?

Accepted Answer

Ventricular repolarization

Answer

Atrial repolarization

Answer

Ventricular depolarization

Answer

AV nodal conduction