ECG

Question 1

The beating of the heart is accompanied by both

Answer 1

electrical activity and sound

Question 2

The pattern of electrical activity produced by each heart beat cycle is called the

Answer 2

electrocardiogram or ECG

Question 3

is a valuable record of the heart’s electrical activity that stimulates the heart to contract

Answer 3

electrocardiogram (ECG)

Question 4

Heart cells are polarized in the __________ but when electrically stimulated, they also _______.

Answer 4

resting state

depolarize and contract

Question 5

Thus a progressive wave of stimulation (depolarization) passes through the heart causing contraction of the myocardium

Question 6

begins the electrical impulse, which spreads in wave fashion stimulating both atria

Answer 6

sinoatrial (SA)

Question 7

sinoatrial (SA) spreads across the atria and yields a ___ wave on ECG

represents the electrical activity that is followed by the contraction of the atria

Answer 7

P wave

Question 8

where there is a 1/10 second pause allowing blood to enter the ventricles.

Answer 8

atrio-ventricular (AV) node

Question 8

After the 1/10 second pause, the _____ is stimulated

Answer 8

AV node

Question 8

After the 1/10 second pause, the AV node is stimulated, initiating an electrical impulse that starts down the _________ into the bundle branches in the ________.

Answer 8

AV bundle (bundle of His)
interventricular septum

Question 9

The bundle branches terminate in the

transmit the electrical impulse into the myocardial cells causing the ventricles to contract

Answer 9

Purkinje fibers