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Lec6-09 - Lec6 2009 INTRODUCTORY ANIMAL PHYSIOLOGY...

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Lec6- 2009 file:///C|/WINWORD/COURSES/31109/Lec6-09.htm[8/19/2009 9:16:26 AM] INTRODUCTORY ANIMAL PHYSIOLOGY BIOAP3110/BIOMS3110/VTBMS3460 FALL 2009 OUTLINE - LECTURE 6 Osmosis and Water 'Transport' (Reading - Chapter 4 pp. 51-52, Chapter 25 pp.296-301) I. Major Topics/Concepts to be covered: 1. Colligative properties of matter. 2. Molarity, molality, isosmotic, isotonic. 3. The process of osmosis. 4. Osmotic pressure. II. You will have learned the material when you can: 1. Predict which way water will flow across a cell membrane given certain conditions of solute concentration, size and charge; and membrane permeability. 2. Understand why isosmotic and isotonic are not the same. III. Sample Problems: 1. A beaker of pure water is separated down the middle by a membrane permeable ONLY to water, sodium and chloride ions. One mole each of NaCl and KCl is suddenly added to the right side of the beaker (assume that mixing and dissolution are instantaneous). Predict the movement of water, NaCl and KCl from T = 0 until equilibrium is reached. Also predict the relative distribution of water, NaCl and KCl between the two sides. 2. Red blood cells act as "micro osmometres" over a range of extracellular osmotic pressure. You have just guzzled a gallon of water to win a bet. What should happen to your red blood cells? Osmosis Summary: 1. Water is moved across biological membranes by creating a 'water potential gradient'. The water flows down this gradient consistent with the 2nd law of thermodynamics. The movement of water down its potential gradient is called osmosis.
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