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Year 1 Summative 1 > BMS10-1022 Physics of Blood Flow > Flashcards

BMS10-1022 Physics of Blood Flow Flashcards

1
Q

Where does the right heart pump to?

A

Lungs

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2
Q

Which circulation has low resistance and pressure?

A

Pulmonary

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3
Q

What is the average SV?

A

70-80ml per beat

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4
Q

What is the average CO?

A

5 litres per minute

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5
Q

Describe the CVS

A 
LV
Large arteries
Arteries
Arterioles
Capillaires
Venules
Great veins
Right ventricule 
Arterioles
Capillaries
Veins
Venules
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6
Q

What kind of pressure is arteriole?

A

Pulsatile

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7
Q

What mainly causes TPR?

A

Small arties and arterioles

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8
Q

CO= (2)

A

MAP/TPR

SV x HR

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9
Q

How do you calculate ejection fraction?

A

SV/EDV

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10
Q

What does TPR determine?

A

Pressure load on left heart (afterload)

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11
Q

What does the CVP determine?

A

Filling pressure (preload)

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12
Q

MAP=

A

CO x TPR

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13
Q

What is darcys law?

A

Flow = (P1-P2)/R

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14
Q

What does the law assume? (2)

A

FLuid is incompressible and Newtonian and flow is laminar

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15
Q

R=

A

8 x viscosity x length / pi x r to the power of 4

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16
Q

What happens when these 2 equations are combined?

A

(p1-p2) pi r to the power of 4 / 8VL

17
Q

What factor is the most important?

A

Diameter as it causes a large change in resistance therefore flow unlike length and viscosity

18
Q

What can increase viscosity and what does this mean?

A

RBC and flow is reduced

19
Q

What is the fahraeus lindqvist effect?

A

Reduces viscosity by getting the cells in the axial stream as they move faster here as there is drag at the sides

20
Q

Which type of type is likely to experience turbulence?

A

Large tubes

21
Q

What 3 factors may lead to turbulence

A

Sharp edges
High velocity
Branch point

22
Q

What is turbulence?

A

Disruption in laminar flow increasing resistance and vibrations

23
Q

What is Reynolds number?

A

Indicates if blood flow is laminar or turbulent

V x D / V

24
Q

What is ohms law?

A

Current = V/R

25
Q

How do you calculate R in series?

A

Add them up

26
Q

How do you calculate R in parallel?

A

1/total = 1/R1 + 1/R2 etc

27
Q

Conductance=

A

1/R

28
Q

Where is series?

A

Terminal artery and arteriole

29
Q

Where is parallel?

A

Capillary

30
Q

Why is resistance high in series?

A

All resistances add up

31
Q

Why is resistance low in parallel?

A

Conductances add up

32
Q

What does it mean if a pressure difference remains constant?

A

It can control its own flow by constricting and dilating

Year 1 Summative 1 (56 decks)

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