Conduction system

Question 1

❤️ conduction system

Answer 1

network : nodes, cells & signals > controls > heart beat

Question 2

2 types : cell > controls hb

Answer 2

1. conducting cell
2. muscle cell

Question 3

conducting cell

Answer 3

carry electrical signal

Question 4

muscle cell

Answer 4

controls > ❤️ contraction

Question 5

Automaticity

Answer 5

HR can begin / maintain rhythmic activity w/o aids : nervous system

Question 6

Excitability

Answer 6

cardiac muscle > accepts / responds > electrical impulse

Question 7

conductivity

Answer 7

cardiac cell > transfer electrical impulse > neighboring cardiac cell

Question 8

contractility

Answer 8

❤️ responds > electrical impulses by contacting

Question 9

how does electrical conduction perform w/ rest ?

Answer 9

electrical conduction system keep up a steady, even HR.
helps your ❤️ speeds up when you need more blood / oxygen or slow down when it is time to rest

Question 10

part : conduction system

Answer 10

contains special cells / node > control your HB

1. sinoatrial node (SA Node)
2. bachmanns bundle (BMB)
3. Atrioventricular node (AVB)
4. bundle : his (B:H) / atrioventricular bundle ( AVB)
5. RT BB
6. LT BB
7. Purkinje Fiber (PF)

Question 11

Another name for sinoatria node
( SA Node)

Answer 11

pacemaker

Question 12

sinoatria node

Answer 12

sends electrical impulse > start HB

Question 13

sinoatria node location

Answer 13

upper part : ❤️ RT atrium, it at edge : atrium near SVC

Question 14

sinoatria node fires electrical impulses:

Answer 14

60-100 time per min ( normal HR)

Question 15

autonomic nervous system

Answer 15

controls how fast / slowly > SA node sends electrical signal

• nervous system directs hormones > controls HR based on WYD

Question 16

sympathetic nervous system

Answer 16

( fight / flight)

makes > SA node works faster, ^ HR

Question 17

parasympathetic nervous system

Answer 17

(rest/digest)

makes > SA node works slower / decrease HR

Question 18

bachmann bundle (BMB)

Answer 18

cardiac impulse > carried both atria by internal tract

Question 19

BMB responsible for

Answer 19

bringing “ depolarization wave” across LT atrium

Question 20

Atrioventricular node ( AV node )

Answer 20

delays > SA node electrical signal
by consistent amount : time.
( fraction : sec ) each time

Question 21

SA node delay ensure

Answer 21

atria = empty : blood before before contraction stop

Question 22

atria located

Answer 22

upper chamber

Question 23

aria receives blood from … and empty …

Answer 23

body / ventricle

Question 24

AV node located

Answer 24

Posterior portion : interatrial septum

lies > subendocarial > medial wall : Rt atrium > Lt : ostium : coronary sinus & immediately posterior > basal attachment : septum cusps : TV

Question 25

another name for Bundle : His ( bundle branches)

Answer 25

Atrioventricular bundle (AVB)

Question 26

Bundle : His ( bundle branches) receives electrical signal to ... & firing rate :

Answer 26

AV node & 40-60 BMP

Question 27

B:H has how many branches

Answer 27

2 1. RT BB 2. LT BB

Question 28

RT BB

Answer 28

sends electrical signal > PF > RT vent

Question 29

LT BB

Answer 29

sends electrical signal > PF > LT Vent

Question 30

Purkinje fiber sends electrical signal very ... & firing rate :

Answer 30

quickly & 20 -40

Question 31

Depolarization : ❤️

Answer 31

orderly passage : electrical current sequentially > ❤️ muscle, changing it, cell by cell > resting polarized state > depolarized state until entire ❤️ > depolarized

Question 32

repolarization

Answer 32

stage : action potential > cells experience > decrease : voltage due > efflux : potassium (K) ions along it electrochemical gradient - phase occurs after cell reaches > highest voltage > depolarization

Question 33

P - wave Impulses initiated by

Answer 33

sinoatria node ( SA node) > spread over atria

Question 34

what does P wave represents ?

Answer 34

Electrical activity associated w / spread : impulse over atria

Question 35

Another name for P wave

Answer 35

wave : depolarization / activity : atria

Question 36

QRS complex

Answer 36

wave : depolarization spread > SA node over > BB ( HIS) & Purkinje system > activate both vents simultaneously

Question 37

P-R interval is measured at

Answer 37

beginning: P wave & beginning : QRS complex

Question 38

P-R interval indicates

Answer 38

time > elapses b/w activation : SA node & AV node

Question 39

J-point

Answer 39

point where QRS complex joint ST segment

Question 40

J-point represents

Answer 40

Approximate end : depolarization & end : repolarization

Question 41

T wave represents

Answer 41

Ventricle repolarization

Question 42

U wave represents

Answer 42

Depolarization : PF