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Flashcards in EKG Basic Principles Deck (40)
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1

info on EKG represents heart's ____ activity

electrical

2

most information on EKG represents electrical activity of ____ of myocardium

contraction

3

when myocardium is electrically stimulated, it ____

contracts

4

while in the resting state, myocytes are POLARIZED, the interior of every cell are ____-ly charged

negative

5

the interiors of resting myocytes are NEGATIVE, but when these cells are DEPOLARIZED, their interiors become ____ and the cells contract

positive

6

"depolarization" moves as a wave through the myocardium; as this wave of DEPOLARIZATION stimulates the heart's myocytes, they become positive and ____

contract

7

depolarization may be considered an advancing wave of ____ charges w/i the heart's myocytes

positive

8

advancing wave of depolarization causes progressive contraction of myocardium as this wave of ____ charges passes through the interiors of myocytes

positive

9

stimulating wave of depolarization makes the interiors of myocytes ____ and stimulates them to contract

positive

10

myocyte interiors regain their resting negative charge during the ____ phase that follows

repolarization

11

myocardial contraction is caused by ____ of myocytes, which records on on the EKG as shown above; the recovery phase that follows depolarization is known as ____

depolarization


repolarization

12

both depolarization and repolarization of the myocardium are ____ phenomena caused by movement of ions

electrical

13

a wave of depolarization advancing through myocardium is a moving wave of ____ charges

positive

14

when a wave of POSITIVE charges (Na+ ions) moves TOWARDS a POSITIVE electrode, there is a simultaneous ____ deflection

UPWARD

15

heart's dominant pacemaker

SA node

16

SA node location

upper-posterior wall of right atrium

17

SA node stimulates both atria to ____

contract

18

ability of SA node to generate pacemaking stimuli is known as ____

automaticity

19

atrial depolarization is recorded as a ____ wave on EKG

P

20

P wave represents

atrial depolarization

21

sole electrical pathway from atria to ventricles

AV node

22

mitral and tricuspid valves act to electrically ____ the ventricles from the atria

insulate

23

because depolarization slows w/i the AV node, there is a brief ____ before depolarization is conducted to the ventricles

pause

24

brief pause allows blood from atria to pass the AV valves and into the ____

ventricles

25

depolarization shoots rapidly through the ventricular conduction system beginning in the ____

His bundle

26

His bundle splits into ____

left and right branches

27

His bundle and both bundle branches are "bundles" of ____

rapidly conducting Purkinje fibers

28

like myocardium, Purkinje fibers use fast-moving ____ for the conduction of depolarization

Na+ ions

29

Purkinje fibers terminate in tiny filaments that directly ____ the ventricular myocytes

depolarize

30

____ represents the beginning of ventricular contraction

QRS complex