Electrocardiogram (ECG)

Question 1

What cardiac event does the P wave of an ECG represent?

Answer 1

Depolarisation of the atria, contraction of the atria

Question 2

What cardiac event does the P-R interval of an ECG represent?

Answer 2

Depolarisation of the atria and delay at the AV node

Question 3

What cardiac event does the QRS complex of an ECG represent?

Answer 3

Depolarisation of the ventricles

Question 4

What cardiac event does the S-T segment of an ECG represent?

Answer 4

Period between ventricular depolarisation and beginning of repolarisation

Question 5

What cardiac event does the T wave of an ECG represent?

Answer 5

Repolarisation of the ventricles

Question 6

What cardiac event does the R-R interval of an ECG represent?

Answer 6

Time between two ventricular depolarisations

Question 7

What is an ECG?

Answer 7

The process of producing an electrocardiogram

Question 8

Looking at the axis of an ECG, where is voltage and where is time?

Answer 8

Voltage is on the Y axis

Time is on the X axis

Question 9

Where are electrodes placed on the chest during an ECG?

Answer 9

Placed so they surround the heart

Question 10

What is the purpose of the electrodes placed on the chest during an ECG?

Answer 10

These electrodes detect the small electrical changes that occur within the cardiac muscle during the cardiac cycle