The Heart Chap 20

Question 1

P wave

Answer 1

The beginning of the heartbeat. It corresponds to the spread of the AP over both atria

Question 2

P-R interval

Answer 2

Measures the time for the impulse conduction from atria to ventricles

Question 3

QRS complex

Answer 3

The impulse reaches the ventricular musculature. Shortly after the QRS complex the ventricles start to contract

Question 4

S-T segment

Answer 4

During this interval the ECG registers zero, all the ventricular muscle is depolarized

Question 5

T wave

Answer 5

Results from ventricular repolarization and occurs just before the ventricles start to relax