Starling's Laws Flashcards
Draw a diagram exemplifying SL through fluid movement in e.g. blood vessels
Define Hydrostatic Pressure
The pressure caused by fluid on the walls of the container or an object within the liquid
e.g. Blood flow on the capilliary walls
Define Oncotic Pressure
A form of osmotic pressure induced by the proteins, notably albumin, in a blood vessel’s plasma that encompasses the effects of osmolality of the solution and the water potential of the liquid on the other side of the membrane.
Why do we talk about the balance of 4 forces in the context of fluid exchange in the capiliaries?
- Hydrostatic pressure of blood flow
- Oncotic pressure of blood plasma
- Hydrostatic pressure from interstitial fluid
- Oncotic pressure from intersitial fluid
Filtration
- What
- Where
- How
- Molecules involved
- Solutes with Low Molecular Weight are allowed to pass through the gaps in the endothelial cells to enter the Interstitial Fluid
- Arterial end of the capillary
- Hydrostatic pressure exceeds oncotic pressure, so fluid moves out of the capillary into the interstitial compartment.
4.
Glucose/Electrolytes/O2/Co2 √
Albumin/Plasma Proteins X
Reabsorption
- What
- Where
- How
- Molecules Involved
- Solutes with Low Molecular Weight are allowed to reenter the bloodstream across the endothelial cells
- Venous end of the capillaries
- The forces of hydrostatic/oncotic pressure are reversed, so fluid moves back from the tissue into the capillary.
- Waste products of cellular respiration / Any unwanted products from initial filtration
What is the formula for Net Filtration/Absorption Pressure?
(H.P of Blood + Oncotic Pressure of ECF) - (H.P of ECF + Osmotic Pressure of Blood)
Which pressures measurement is approxamately equal between the arterial and venous ends?
Oncotic Pressure of Blood, and the Osmotic Pressure of the ECF
