ECG Basic Electrocardiogram 2

Question 1

What does the P wave on an ECG tracing represent?

Accepted Answer

Atrial depolarization

Answer

The P wave reflects the electrical impulse spreading through the atria, causing atrial depolarization.

Question 2

The QRS complex primarily represents which cardiac event?

Accepted Answer

Ventricular depolarization

Answer

The QRS complex records the rapid depolarization of the right and left ventricles.

Question 3

What structure is normally the heart's primary pacemaker?

Accepted Answer

Sinoatrial (SA) node

Answer

The SA node in the right atrium initiates the normal heartbeat and sets the heart rate.

Question 4

The T wave on a standard ECG represents:

Accepted Answer

Ventricular repolarization

Answer

The T wave reflects the recovery, or repolarization, of the ventricles.

Question 5

How many electrodes are placed on the chest in a standard 12-lead ECG?

Accepted Answer

Six

Answer

Six precordial (chest) electrodes are placed, V1 through V6, along with four limb electrodes.

ECG (Electrocardiogram) Practice Test