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Flashcards in hemodynamics Deck (28)
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1

Capacitance vessels

veins - holds most of the blood

2

Total volume

5L

3

Flow equation

Q = dP/R

4

Unit Q

mL/min

5

Cardiac output (CO)

total flow in the CV system

6

Velocity

Q/A, highest in aorta

7

Poiseuille equation

Q = dP * pi * r^4/8 nl

8

flow is proportional to the __ th power of radius

4th

9

Rtot in parrallel is ____ than the resistance of any single vessel

lower

10

Parallel - changing a single vessel has ___ effect on system

little/low

11

Total resistance of capillary bed is ___ and is _____ of individual capillaries in parallel

low, independent

12

Rtot of a series of vessles is ___ than the resistance of any indivudal vessels

higher

13

Turbulent flow has ___ and ___

edies and vortices

14

Turbulent flow arrises in:

large diameter, high velocity, low viscosity, change in diameter, irregularity on walls

15

Turbulent flows produces ___ forces that ___ vascular endothelium

Shearing; Damage

16

flow is ___ in aorta

pulsatile

17

Flow is ___ in capillaries

continuous

18

Systolic pressure vs Diastolic pressure

peak/min aortic pressure

19

Pulse pressure eq =

Psys - Pdias

20

MAP = mean arterial pressure eq:

Pdias + 1/3 (Psys-Pdias)

21

arteriosclerosis define

vessels lose compliance (with age)

22

compliance (def/eq)

C = dV/dP
elastic property of vessels (absorb pulsatile flow to continuous)

23

aneurysm

weakened wall - buldges out (higher tension)

24

Laplace equation

T = dP r/mu (mu = wall thickness)

25

Hydrostatic pressure promotes:

outwards - filtration

26

Oncotic pressure promotes:

reabsorption - inward flow

27

Net flux is a balance of:

filtrateion/reabsorption
Hydrostatic vs oncotic

28

net flux eq

flux = k (dP - donc)
flux= k [(Pc - Pi) - (Oncc-Onci)]