4.8 Homeostasis Flashcards Preview

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Flashcards in 4.8 Homeostasis Deck (103)
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1

Edema

accumulation of fluid in interstitial space - several causes

2

Hydrothorax

collections of fluids - low protein (basically water) so not an infection

3

Ascites

peritonial cavity fluid acumulation - abdomen

4

Anasarca

whole body edema

5

Transudate

low protein fluid that leaks out (mostly water)

6

Exudate

high protein fluid leaking out

7

Effusion

collection of fluid in the cavity

8

Hyperemia

increased dialation of vessels, an active process caused by mediators

9

Congestion

blood can't get out of vessels and looks red, caused by blockage

10

Hemorrhage

beeding

11

Hematoma

collection of fluid in tissue

12

tissue hydrostatic pressure, oncotic pressure, and tissue compliance affct the

vessel and amout of resistance

13

Pc

capillary pressure

14

Pa

arterial end pressure

15

Pv

venous end pressure

16

Ra

arterial end resistance

17

Rv

venous end resistance

18

thigns that increase pressure at capilary level induce

lots of fluid leaving

19

what will change the rate of fluid leaving most drastically

venous block - increase in venous pressure will cause over a 5 forld increase in fluid leaving due to the increased hydrostatic pressure.
With hypertension you don_t see puffy faces, but with venous block you'll have inc fluid in tissues. bc Ra > Rv inc in Pa has less of an effect on Pc than inc in Pv

20

Pc formula

Pc = ((Rv/Ra)Pa + Pv) / (1 + (Rv/Ra) )

21

Tissue hydrostatic pressure (Pt) formula

Pt = Tf x Tc

22

Tf

tissue fluid

23

Tc

tissue compliance

24

Pt is usually near

0

25

Tc is usually

low

26

inc in Tf causes

inc in Pt

27

inc in Pt

usually timints Tf

28

where is Tc very high and what is the effect?

lungs bc there is air surrounding capllaries so no back pressure,
so in congestive heart failure when there is an increase in pulmonary aretery pressure,
you'll see pulmonary edema

29

osmotic/oncotic pressure (Pcos)

capilary osmotic/oncotic pressure due to proteins

30

Pcos is determined by

permeabiity of endothelium to proteins and amount of fluid vs protein