Electrocardiography

Question 1

process of recording electrical activity of the heart over a period of time using electrodes placed on the skin

Answer 1

electrocardiography

Question 2

heart depolarization starts with

Answer 2

pacemaker cells

in the sinoatrial node (SA)

Question 3

generates the impulses

Answer 3

sinoatrial node

Question 4

order of the depolarization of the heart

Answer 4

1. SA node
2. 1 s
3. atrioventricular node
4. Bundle of His (AV bundle)
5. bundle branches
6. subendocardial conducting network (Purkinje fibers)

Question 5

conncts the atria to the ventricles

Answer 5

AV bundle

Question 6

conduct the impulses through the interventricular septum

Answer 6

bundle branches

Question 7

depolarizes the contractile cells of both ventricles

Answer 7

subendocardial network (purkinje fibers)

Question 8

ECG can be used to

Answer 8

to measure the rate and rhythm of heartbeats
size and position of heart chambers
the presence of any damage to the heart’s muscle cells or conduction system
effects of cardiac drugs
function of implanted pacemakers

Question 9

overall goal of performing electrocardiography

Answer 9

obtain information about the structure and function of the heart