PHYS 215 Lecture Notes - Lecture 3: Osmotic Concentration, Extracellular Fluid, Cell Membrane
31 Dec 2018
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What is the chemical composition of cells: fig 15-2 handout pg. Inside the cell is high in potassium and phosphate: outside the cell is high sodium and chloride. Protein: cell highest concentration, low concentration outside cell. Bicarbonate hco3: cell low concentration, high concentration outside cell. Are the number of anions and cations in an individual compartment equal: yes, each compartment is electrically neutral because there is the same number of anions and cations. Why is cell volume important: cells maintain their volume to prevent, lysis or dehydration, why does a cell burst, plasma membrane stretched too much, why is cell dehydration not good, enzymes, salt, etc. become too concentrated. What is cell osmolarity: osmolarity = concentration of osmotically active salts or solutes inside the cell, what is the normal osmolarity of a cell, 300 mosm/l. Is the osmolarity of the ifc and efc different: no, at equilibrium, the osmolarity of the icf and ecf are equal.
