Christine - Handout 1 key x - TA Christine Yen...

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TA : Christine Yen Section : Monday 11 AM, HSS 1305 [email protected] OH : Tuesday 12-1 PM, Fireside Lounge BIPN 100: Handout 1 Diffusion/Osmosis 1) Diffusion can be described as the constant, random movement of molecules in gases and liquids due to the kinetic energy they have. If there is a concentration gradient , molecules will move from regions of high to low concentration until equilibrium is achieved. 2) Osmosis is the diffusion of water molecules across a membrane from areas of low solute concentration to areas of high solute concentration. 3) Describe osmotic pressure and give a physiological example of when it is applied. Osmotic pressure refers to the amount of pressure required to oppose osmotic movement. The buildup of proteins and water beneath damaged tissue results in a blister. When you apply pressure on a blister by pressing on it, the fluid in the blister evenly spreads out. This application of pressure counters the osmotic movement of water. 4) Calculate the osmolarities of the following particles and note which has the higher osmolarity. 50 mM sucrose = 50 mOsm sucrose 50 mM NaCl= 100 mOsm NaCl The osmolarity of NaCl is greater than the osmolarity of sucrose Tonicity 5) A red blood cell is suspended in a solution of NaCl. The ICF has an osmolarity of 200 mOsm while the ECF has an osmolarity of 150 mOsm. a) The extracellular solution is ( hypotonic /isotonic/hypertonic ) to the cell b) Water would move ( into the cell /out of the cell/or not at all ), causing the cell to swell in volume.
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