7.3.3 - ECGs & Diagnosing CVD

Question 1

What Is Electrocardiography?

Answer 1

Used to monitor and investigate the electrical activity of the heart.

Question 2

Describe Electrocardiograms (ECG)
(3 Points)

Answer 2

~ Electrodes that are capable of detecting electrical signals are placed on the skin.

~ These electrons produce an EGC.

~ An EGC shows the number of distinctive electrical waves produced by the activity of the heart.

Question 3

Describe The P Wave Of This ECG Of A Healthy Heart

Answer 3

Caused by depolarisation of the atria, which results in atrial contraction (Systole).

Question 4

Describe The QRS Complex Of This ECG Of A Healthy Heart
(2 Points)

Answer 4

~ Caused by depolarisation of the ventricles, resulting in ventricular contraction (Systole).

~ The bigger the wave, the stronger the contraction.

Question 5

Describe The T Wave Of This ECG Of A Healthy Heart

Answer 5

Caused by repolarisation of the ventricles, which results in ventricular relaxation (Diastole).

Question 6

Describe The U Wave Of This ECG Of A Healthy Heart

Answer 6

Unknown to scientists.

Question 7

Describe Tachycardia
(2 Points)

Answer 7

~ When the heart beats too fast.

~ An individual is said to have this, if their resting heart rate is over 100 bpm.

Question 8

Describe Bradycardia
(2 Points)

Answer 8

~ When the heart beats too slow.

~ An individual is said to have this, if their resting heart rate is below 60 bpm.

Question 9

Describe Ectopic Heartbeat
(2 Points)

Answer 9

~ This condition is caused by an early heartbeat followed by a pause.

~ Could be due to an earlier contraction of either the atria or ventricles.

Question 10

Describe Fibrillation
(2 Points)

Answer 10

~ Is an irregular heartbeat.

~ Atria and ventricles stop contracting properly.