Lecture 17: Hemodynamics (Hayward) Flashcards Preview

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Flashcards in Lecture 17: Hemodynamics (Hayward) Deck (25)
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1
Q

which vessels have large elastic layer? why?

A

Arteries. Stores energy so you can continuously push blood through CV when heart is not actively pushing it through

2
Q

Flow formula

A

F = (P1-P2)/R Q=F=Flow

3
Q

Cardiac output formula

A

CO = (MAP-RAP)/TPR TPR = resistance in entire vascular tree ***MEMORIZE

4
Q

Sickle cell anemia

A

fibrinogen in RBCs increases, decreasing their flexibility and results in disturbances in regional blood flow

5
Q

increasing radius of tubes–> TPR

A

decreases

6
Q

Increasing number of tubes in parallel –> TPR

A

decreases

7
Q

Increasing tube length –> TPR

A

increases

8
Q

Poiseuille’s Law

A

describes effect of length, radius, number of tubes, etc. effect resistance

9
Q

Tubes in parallel generally have _____ resistance to tubes in series

A

lower

10
Q

MAP formula**

A

MAP = CO * TPR

11
Q

velocity def. and formula

A

distance a fluid travels per unit time. V=Q/A

12
Q

increased cross-sectional area –> velocity

A

decreases

13
Q

in laminar flow shear stress on vascular walls is prop. to

A

rate of flow

14
Q

ONLY place where energy can be added to vasculature

A

heart

15
Q

2 components of total energy stored in vasculature

A

1) KE (forward projecting)

2) PE (lateral projecting)

16
Q

anemia –> turbulent flow

A

increases

17
Q

Reynold’s number

A

predicts turbulence. Re=VDdensity/viscosity

18
Q

high blood velocity –> turbulent flow

A

increases

19
Q

larger vessel size –> turbulent flow

A

increases

20
Q

Bernoulli’s Principle

A

total energy at one area in a closed system must equal total energy in another area. Achieved by Pressure/volume/area/velocity relationships

21
Q

velocity ______ as venous blood comes out of capillaries and heads back to heart

A

increases (but at a lower velocity than it left heart)

22
Q

aortic stenosis –> lateral pressure

A

decreases

23
Q

aortic stenosis –> coronary filling

A

decreases. Harder time getting blood out and storing energy

24
Q

aneurysm

A

abnormal dilation of blood vessel walls resulting from disease of the vessel wall. weak vessel wall

25
Q

aneurysm –> pressure on vessel wall

A

increases (due to increased vessel diameter)

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