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Flashcards in CVS 1&2 Deck (74):
0

Irritability/excitability

Chronotropic effect

1

Conductivity

Domotropic Effect

2

Contractility

Inotrophic effect

3

Innermost layer of the heart

Endocardium

4

Thickest layer of the heart

Myocardium

5

Outermost layer of the heart

Pericardium

6

Adherent to the lungs

Parietal pericardium

7

Adherent to the heart

Visceral Pericardium

8

No overlapping

H zone

9

Area of Thin filament

I band

10

Thick/myosine filament

A band

11

"Crossbridge"

Myosine head

12

Node of Keith and flack

SA node

13

Located below the superior vena cava and right atrium

SA node

14

Node that has no actin and myosin and not specialized for CONTRACTION

SA node

15

Node of kent and tawara

AV node

16

Conduction rate : 0.05 per minute

AV node

17

Only area where we can conduct impulses from atria to ventricle

AV node

18

Conduction rate: 1 millisecond

Bundle of his

19

Has the fastest conduction velocity of 4 millisecond

Purkinje fibers

20

It's conduction depolarizes the whole atrial muscle tissue

SA node

21

Anterior internodal pathway

Bachmann Tract

22

Middle internodal pathway

Wenckebach Tract

23

Posterior Internodal Pathway

Thorel tract

24

In the AV node, the only way to transmit impulses is thru the

Bundle of His

25

Depolarizes the interventricular septum

AV node

26

T or F: the Postero basal area of the ventricle will be the first to repolarize

TRUE
the last to depolarize will be the first to repolarize

27

Parasympathetic NS, fibers come from

Vagus nerve ( extrinsic innervation )

28

Right vagus is distributed to

SA node

29

Left vagus is distributed to

AV node

30

Has muscarinic / cholinergic receptors

Parasympathetic Nervous system

31

Sympathetic fibers mainly come from

Stellate Ganglion

32

Fusion between t1 and inferior cervical ganglion

Stellate ganglion

33

Stimulation decreases heart rate and conduction velocity

Parasympathetic NS

34

Increased HR, conduction velocity and atrial and ventricular conduction

Sympathetic NS

35

Has beta 1 receptors / adrenergic receptors

Sympathetic NS

36

Resting membrane potential/automaticity of the heart

Phase IV

37

Rapid depolarization due to sodium influx

Phase 0

38

Initial and brief repolarization due to potassium efflux

Phase 1

39

Plateau phase due to calcium influx

Phase II

40

Rapid repolarization phase due to potassium efflux

Phase III

41

Blocked by calcium blockers (Class IV anti arrhythmic drugs)

Phase II

42

Blocked by class 3

Phase III

43

Blocks sodium channels

Class 1

44

Beta blockers

Class 2

45

Potassium blockers

Class III

46

Calcium blockers

Class IV

47

More probe to heart block due to their slow response and slow conductance

SA node and AV node

48

Increase duration of cardiac cycle

Decrease heart rate

49

Decrease duration of cardiac cycle

Increase heart rate

50

Closure of the SL valves and opening of the AV valves

Isovolumetric Relaxation Phase

51

ESV

50 ml

52

Begins with Opening of AV valve and ends when they close

Ventricular filling phase

53

70% of blood goes to the ventricles very rapidly

Rapid filling phase

54

Also known as diastasis

Reduced filling phase

55

Completes the ventricular filling ( 20-25% ) and not essential to ventricular filling

Atrial systole

56

Ventricle is in the contraction phase

Systole

57

Begins with the closure of AV valves and ends with the opening of semilunar valves

Iso volumetric contraction

58

EDV

120ml

59

Begin ha with the opening of Semilunar valves and ends with its closure

Ejection phase

60

Has the highest pressure

Ejection phase

61

Shorter and rapid phase

Rapid ejection phase

62

Decreases ventricular volume

Increased aortic and ventricular pressure

63

Longer and slower phase due to increasing pressure in the great arteries and lessening pressure in the ventricles

Reduced ejection phase

64

Rapid fall of already falling ventricular pressure while ventricles are still contracting

Protodiastole

65

Caused by they push of blood from the aorta to the aortic semilunar valve

Incisura or Dicrotic notch

66

Condition in which there is increased atrial pressure

Jugular pulses

67

Corresponds to atrial systole

A WAVE

68

Produced by bulging of the tricuspid valve into the right atrium during isovolumetric contraction

C Wave

69

Rise in atrial pressure before the tricuspid valve opens

V Wave

70

1st heart sound

Lub
Closure of AV valves

71

2nd heart sound

Dub
Closure of SL valves

72

3rd heart sound

Rapid ventricular filling

73

4th heart sound

Due to atrial systole