PSYC 2490 Lecture Notes - Lecture 1: Osmometer, Tonicity, Molar Concentration
5 Mar 2018
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Two distinct fluid compartments the cells fluid that surrounds the cells. This results due to ions of opposing charge being present in the ecf and icf: this is called a dynamic steady state, homeostasis maintains a dynamic steady state to support physiological functions. Distribution of solutes in the body is determined by if the substance in question can cross the membranes of cells (cell membrane) Water can freely cross almost every cell in the body the body has osmotic equilibrium: water moves through aquaporins ion channels specifically for water. Icf 2/3 or 66. 7: ecf 1/3 or 33. 3, 75% interstitial fluid, 25% plasma. The body is in osmotic equilibrium the body is in a state of osmotic equilibrium. Osmolarity describes the number of particles in solution. Quantitative measure of osmotic movement: know the concentrations of each solution. Compare as long as the units are the same. Two solutions have the same solute particles per unit volume = isosmotic.
