Lecture 17: Hemodynamics (Hayward) Flashcards Preview

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

which vessels have large elastic layer? why?

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

2

Flow formula

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

3

Cardiac output formula

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

4

Sickle cell anemia

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

5

increasing radius of tubes--> TPR

decreases

6

Increasing number of tubes in parallel --> TPR

decreases

7

Increasing tube length --> TPR

increases

8

Poiseuille's Law

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

9

Tubes in parallel generally have _____ resistance to tubes in series

lower

10

MAP formula****

MAP = CO * TPR

11

velocity def. and formula

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

12

increased cross-sectional area --> velocity

decreases

13

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

rate of flow

14

ONLY place where energy can be added to vasculature

heart

15

2 components of total energy stored in vasculature

1) KE (forward projecting)
2) PE (lateral projecting)

16

anemia --> turbulent flow

increases

17

Reynold's number

predicts turbulence. Re=V*D*density/viscosity

18

high blood velocity --> turbulent flow

increases

19

larger vessel size --> turbulent flow

increases

20

Bernoulli's Principle

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

21

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

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

22

aortic stenosis --> lateral pressure

decreases

23

aortic stenosis --> coronary filling

decreases. Harder time getting blood out and storing energy

24

aneurysm

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

25

aneurysm --> pressure on vessel wall

increases (due to increased vessel diameter)

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