Solution that bathes & surrounds cells of multicellular animals. The main component of extracellular fluid, which includes plasma & transcellular fluid. Found in interstitial spaces, also known as the tissue spaces.
Fluid just outside the blood vessels. (Eye, CSF, mucus, gastric juices
is a measure of solute conc. defined as number of osmoles of solute per liter of solution (osmol/L) –temp. dependent (if temp goes up, volume expands)
specific for molecules exerting osmotic pressure
is a measure of the osmoles of solute per kilogram of solvent
not temp dependent (because weight is not temp dependent)
proteins embedded in the cell membrane that regulate the flow of water
What is dissolved in water (Solvent): Salt, NaCl, K, phosphate buffers, bicarb buffers.
All contribute to molarity, osmolarity, and [solute].