# HW1_solutions - BIOE 398BS: Quantitative Human Systems...

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BIOE 398BS: Quantitative Human Systems Physiology Spring 2007 Bioengineering, University of Illinois at Urbana-Champaign 1 Problem Set 1. Due Friday, Jan. 25, 2008. 1. Define: osmosis, osmotic pressure, semipermeable membrane. Describe these in terms understandable to a high school student.

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BIOE 398BS: Quantitative Human Systems Physiology Spring 2007 Bioengineering, University of Illinois at Urbana-Champaign 2 2. (a) Write the form of Fick’s first law of diffusion that describes diffusion of a substance across a membrane. (b) What is the meaning of the symbols in the equation? (c) State in words what the equation says. (a) One of the following: ( ) ( ) , , , , i m o m i m m o m i m dC J DA dx DA J C C x DA J C C x ! = " = " " # = " " # (b) What is the meaning of the symbols in the equation? J: flux of substance across membrane; net rate of diffusion of the substance across the membrane. D: Diffusion coefficient; how easily the substance moves in the membrane A: Cross-sectional area of the membrane β : lipid solubility of substance; oil/water partition coefficient Δ x m : membrane thickness dC i /dx: Concentration gradient. C
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## This note was uploaded on 07/24/2008 for the course BIOE 398 taught by Professor Bioe during the Fall '07 term at University of Illinois at Urbana–Champaign.

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HW1_solutions - BIOE 398BS: Quantitative Human Systems...

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