Physiology 2130 Lecture Notes - Lecture 5: Extracellular Fluid, Starling Equation, Reabsorption
23 Dec 2015
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Types of exchange in capillaries: diffusion ii. Movement of fluid across capillary depends upon a balance of four forces called starling forces. The endothelial cells are sealed really tightly in the brain. Inside the capillary you have plasma outside you have interstitial fluid. Water or any substances move out of the capillary is filtration. Water or any substances moving in to the capillary is reabsorption. Concentration of interstitial fluid and plasma because they"re free to move. Pressure inside the capillaries is trying to move the fluid out causing filtration. Hydrostatic pressure of the capillaries is trying to force the fluid out o. Pressure can vary from organ on the fluid o. When it"s positive it pushes fluid back in the fluid causing reabsorption. When it"s negative it"s drawing fluid out of the capillary. These proteins can cause osmosis across the capillary concentration. Osmosis is drawing water towards areas that have a high solute.
