MICRO 20 Lecture Notes - Lecture 3: Methylene Blue, Silver Nitrate, Osmosis
Document Summary
Browian notion the random movement of microscopic particles suspended in a liquid or gas, caused by the collisions that occur between these particles. Movement of solute molecules across a semipermeable membrane from high to low concentration. Movement of water (solvent) molecules across a semipermeable membrane from high to low concentration. Allow some molecules to cross but not others. Selects based on size only where small ions can cross and large molecules can"t. Water moves to the solute to dilute it of water concentration. Number of moles equals number of osmoles except when molecules split in water. Most of the time extracellular fluid is the same. Cell volume remains the same one molecule moves out of the cell another moves in. Solution with a higher water concentration or lower solute than intracellular fluid. Solution with a lower water concentration or higher sole. + = dye has only just begun to diffuse. ++ = dye has diffused a significant distance.
