Matt - Handout 1 key x - IA Matthew Chan Section Thurs...

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IA: Matthew Chan Section: Thurs 7-8pm @Center 201 BIPN 100 Handout 1 Inspired by Teon Lejawni Topics Covered Diffusion and Osmosis Osmolarity Ohm’s Law Fick’s Law of Diffusion Lipothilic molecules Channels Transporters Diffusion and Osmosis 1. Diffusion The movement of substances from high to low concentrations. a. More specifically: All molecules have kinetic energy, causing the molecules to disperse randomly and distribute uniformly. 2. Osmosis The diffusion of water from high to low concentration, or the movement of water from low solute concentration to high solute concentration. (why is this?) a. Osmotic pressure Pressure required to oppose osmosis Osmolarity and Tonicity 1. Osmolarity The number of osmotically active particles per liter of solution. 100 mM Glucose = 100 mOsm Glucose 100 mM NaCl = 200 mOsm NaCl 2. Tonicity Describes a solution and how that solution would affect a cell’s volume A red blood cell contains 3 solutes: X, Y, and Z. The concentrations of each solute are noted as the following: [X] RBC = 300 mM, [Y] RBC = 600 mM, [Z] RBC = 400 mM. The permeability (P) of each solute are: P X = 0, P Y = 0, P Z = . If the red blood cell is placed in the following solutions: Predict the solution’s tonicity and whether water moves in or out of the cell. Assume that the solutes do not dissociate in solution.
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