CH 21- Capillary Exchange

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1

Arterial Blood Pressure

maintains blood flow through capillaries
-must overcome peripheral resistance

2

Systolic Pressure

peak pressure in arteries during ventricular systolic

3

Diastolic Pressure

peak pressure in arteries during ventricular diastole

4

Pulse Pressure

systolic - diastolic

5

Mean Arterial Pressure

propels blood to capillaries

6

Mean Arterial Pressure

average pressure in blood vessel

7

diastolic + pulse pressure/3

Mean arterial pressure formula

8

MAP

declines as arteries become smaller but larger in number

9

Pulse Pressure

declines as result of damped elastic rebound of arteries

10

Hypertension

high BP > 140 / 90

11

Hypotension

low BP

12

Venous Pressure

vessel with relatively low pressure

13

Venous pressure

pressure change ~16mmHG
from 18mmHg - 2

14

Muscular pump

contraction of neighboring skeletal muscles

15

Respiratory pump

inhalation decrease of pressure in pleural cavity - pulls blood into inferior vena cava
superior not needed-gravity

16

Respiratory pump

exhalation increases pressure in cavity pushes blood into right atrium

17

Capillary exchange

water, ions, small organic molecules btw cells or through pores of fenestrated cap

18

water, ions, small organic molecules

capillary exchange substances

19

venous pressure

determines venous return and influences cardiac output

20

inhalation decreases
exhalation increase

respiratory inhalation/exhalation pump functions

21

Filtration

pushing-out solutes and water at porous membrane

22

Filtration

only water and small solutes
-usually arterial end
-due to high capillary hydrostatic
pressure

23

hydrostatic pressure

causes filtration

24

reabsorption

results from osmosis

25

osmosis

diffusion of water across a semipermeable membrane

26

hydrostatic pressure

prevents osmosis

27

more trapped molecules

causes greater osmotic pressure

28

blood collied osmotic pressure

osmotic pressure in blood

29

Capillary hydrostatic pressure

difference between capillary pressure interstitial fluid

*out of capillary*

30

hydrostatic

fluid pressure

31

~O mmHg

normall pressure of interstitial fluid

32

35-18mmHg

pressure in capillaries

33

Net *colloid* osmotic

*in* capillaries

difference between BCOP and Interstitial osmotic pressure

34

blood colloid osmotic pressure

BCOP

35

25 mmHg

BCOP pressure amount goes into capillaries via *filtration* and *reabsorption*

36

0-1 mmHg

interstitial osmotic pressure amount

37

CHP > BCOP

pressure of capillary at arterial end

38

BCOP > CHP

pressure of capillary at venus end

39

+10mmHg; 35 out 25 in

NFP of arterial pressure via filtration

40

-7mmHG; 18 out 25 in

NFP of venus pressure via reabsorption

41

Net filtration pressure

determines direction of movement in or out of capillary

42

NFP

diference between net HP and net COP

43

NFP = NHP -NCOP

net filtration formula

44

CHP - IHP

net hydrostatic pressure formula

45

BCOP - ICOP

net colloid osmotic pressure formula

46

Filtration function OUT of capillaries

1. communication btw plasma and ECF
2. DIstribution of nutrients, hormones, and gasses to tissues
3. Transports insoluble lipid and tissue protein that cannot cross capillary wall
4. Flushes toxins to lymph tissue

47

communication

filtration out of cap btw plasma and ecf

48

distribution

filtration out of cap of nutrient, hormones and gasses to tissues

49

transports

filtration out of cap of insoluble lipid and protein that cant cross cap wall

50

flushes

filtration out of cap of toxin to lymph tissue

51

net hydrostatic pressure

forces water and solutes *out* of capillaries and into interstitial fluid *at arterial end* through *filtration*

52

osmotic pressure

forces water *into* capillaries at *venus end* via *reabsorption*

53

filtration at arterial end of water and solutes *out* of capillaries

net hydrostatic pressure function NHP

54

reabsorption at venus end of water into capillaries

osmotic pressure