Bell Ring - Waves and Intervals

The PR interval spans 5 small boxes. What is the duration of the PR interval?

• 0.16 seconds

• 0.20 seconds

• 0.12 seconds

• 0.24 seconds

The QRS complex spans 2 small boxes. What is the duration of the QRS complex?

• 0.06 seconds

• 0.08 seconds

• 0.10 seconds

• 0.12 seconds

The QT interval measures 10 small boxes. What is the duration of the QT interval?

• 0.40 seconds

• 0.32 seconds

• 0.50 seconds

• 0.44 seconds

The QRS interval starts at the beginning of the _______ and stops at the end of the _______.

• a. P wave, T wave

• b. Q wave, S wave

• c. R wave, T wave

• d. P wave, R wave

The PR interval starts at the beginning of the _______ and stops at the beginning of the _______.

• A) P wave; QRS

• B) QRS; T wave

• C) T wave; P wave

• D) QRS; P wave

What does the QRS complex represent in an ECG?

• A) Atrial depolarization

• B) Ventricular depolarization

• C) Ventricular repolarization

• D) Atrial repolarization