Lymph Capillary Exchange

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1

Filtration

pushing OUT of solutes and water at porous membrane (capillary endothelium)

2

Filtration solubles

only water and small solutes

3

Filtration occurrence

usually at arterial end of capillary due to higher capillary hydrostatic pressure (CHP)

4

Osmosis

diffusion of water across selective permeable membrane

5

Reabsorption

results from osmosis

6

Osmotic Pressure

hydrostatic( = liquid) pressure needed to prevent osmosis; more trapped solutes is greater osmotic pressure

7

Blood osmotic pressure

BCOP- blood colloid osmotic pressure

8

Net filtration pressure NFP

determines the direction of movement
(in or out of capillary)

9

Net filtration formula NFP

NFP = NHP - NCOP

10

Net hydrostatic pressure NHP

OUT of capillary
Difference between capillary hydrostatic pressure CHP (35-18mmHg) and hydrostatic pressure of interstitial fluid (normally 0mmHg)

11

Net colloid osmotic pressure

INTO capillary
Difference btw blood colloid osmotic pressure BCOP (25 mmHG) and interstitial osmotic pressure ( 0-1 mmHG)

12

Functions of NF out of Capillary (4)

1. Communication
btw plasma and ECF
2. Distribution
nutrients, hormones and gasses
from tissue
3. Transport
insoluble lipid/proteins, these enter
blood through lymphatic system
4. Flushes
bacterial toxins/ chemical stimuli

13

Hydrostatic pressure

Pressure exerted by a volume of fluid against a wall, membrane, or some other structure that encloses the fluid.

14

Osmotic pressure

the external pressure that must be applied to stop osmosis