(= movement of water and electrolytes 1. plasma interstitial fluid capillary protein RBC 2. intra- and extra- cellular fluid proteins and positive ion: permeability t water and negative ion: permeability (water movement- balance of osmotic pressure)（二） movement of water and electrolytes 1. plasma interstitial fluid capillary protein 2. intra- and extra- cellular fluid proteins and positive ion: permeability water and negative ion: permeability (water movement balance of osmotic pressure) R B C