Cardiovascular Physiology Flashcards Preview

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Flashcards in Cardiovascular Physiology Deck (76):
0

Control conduits for blood flow

Arterioles

1

A 1

Smooth muscle contracion

2

B2

Smooth muscle relaxation

3

Veins contain what receptors

A1

4

What is Ohm's law

Q(flow)= ^P/R

5

Associated with high reynold's number

Turbulent flow

6

Turbulent flow is seen in

Anemia

7

Stroke volume/ arterial compliance

Pulse pressure

8

Pressure in the capillaries

17mmHg

9

Pressure in the vena cava

0mmHg

10

Pressure in the pulmonary arteries

25mmHg

11

Pressure in the capillaries

7mmHg

12

Atrial depolarizatiob

P wave

13

Av node conduction

PR sement

14

Conduction time/ velocity through the av node

PR interval

15

Ventricular depolarization

QRS

16

Ventricular repolarization

T wave

17

Period of depolarization+ repolarization of ventricles

QT interval

18

Plateau of ventricular action potential

ST segment

19

Ventricular action potential: Na influx

0

20

Ventricular action potential: K efflux

1

21

Ventricular action potential: Ca influx

2

22

Ventricular action potential: K efflux

3

23

Ventricular action potential: RMP

4

24

SA node action potential: slow Na influx towards threshold

4

25

SA node action potential: Ca influx

0

26

SA node action potential: K efflux

3

27

Basis for v fib

Circus movements

28

Changes in the rate of relaxation

Lusitrophic

29

Changes in conduction velocity

Dromotrophic

30

Stressed volume

Arteries

31

Low P waves, tall T waves

Hyperkalemia

32

Flat inverted t waves, with u waves

Hypokalemia

33

Prolonged qt interval

Hypocalcemia

34

Shortened QT interval

Hypercalcemia

35

AV block that causes fainting in patients due to initially supressed state of Purkinje fibers

Stokes Adam syndrome

36

Produces changes jn rate of relaxation

Lusitrophic

37

Produces changes in conduction velocity

Dromotrophic

38

Affected by inotropes

Stroke volume

39

Chronotropes affect

SA node

40

Dromotropes affect

AV node

41

Phase of cardiac cycle: distal third of diastole

Atrial contraction

42

A wave is seen

Atrial contraction

43

4th heart sound

Atrial contraction

44

Preceeded by p wave

Atrialn contraction

45

Phase of cardiac cycle: preceeded by QRS complex

Isovolumic contraction

46

Phase of cardiac cycle: c wave

Isovolumic contractiont

47

First heart sounds

Isovolumic contraction

48

Phase of cardiac cycle: atrial filling begins

Rapid ventricular ejection

49

Phase of cardiac cycle: t wave

Reduced ventricular ejection

50

Phase of cardiac cycle: incisura

Isovolumic relaxation

51

Phase of cardiac cycle: v wave

Isovolumic relaxatiob

52

Phase of cardiac cycle: second heart sound is heard

Isovolumic relaxation

53

3rd heart sound is heard

Rapid ventricular filling

54

Longest phase of cardiac cycle

Reduced ventricular filling

55

Slight increase in aortic pressure during isovolumic relaxation

Incisura

56

Center responsible for regulation of HR and BP

Vasomotor area of medulla; lateral - excitatory; medial-inhibitory

57

Parasympathetic stimulation of the heart causes

Dec contractility in the atria ONLY; dec HR and conduction velocity

58

Where are baroreceptors found

Carotid sinus and aortic arch

59

Respond to increase/ derease in pressures from 50-180 mmHg

Carotid baroreceptors

60

Respond to increase in pressures >80 mmHg

Aortic baroreceptors

61

Caratois sinus baroreceptors are mediated by what CN?

IX

62

Aortic arch baroreceptors are mediated by what CN?

x

63

BP control mechanisms that respond to low O2, high CO2 concentration whenever BP is <80mmHg

Chemorecptord

64

Increased HR; helps match VR with CO

Bainbridge reflex

65

CNS ischemic response stars at BP of

<60mmHg

66

All systemic arterioles vasoconstrict severely except for coronary vessels, cerebral vessels

CNS ischemic response

67

Triad of HPN, bradycardia, irregular respirations

Cushing rxn or cushing reflex

68

Describes fluid movement into or out of the capillary

Starling forced

69

Normal net filtration (starling forces)

2mL/min

70

Mehanisms for local blood flow control

Myogenic theory, metabolic theory

71

Most potent vasoconstrictor

Vasopressin

72

Implicated in migraine

Serotonin

73

Released by damaged endothelium

Endothelin

74

Counteracts TXA2

Prostaglandin

75

Vasodilators in muscles

Lactate, adenosine