hmw2 - Due Monday, Jan 31, 2011 BME 201, Spring 2011 -...

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Due Monday, Jan 31, 2011 BME 201, Spring 2011 - HOMEWORK #2 Membrane Biophysics Problem I. Consider a cell placed in a petri dish. The concentrations of major ions are given below. Ion Intr. Conc. Extr. Conc. (mM) (mM) K + 280 10 Na + 61 485 Cl - 51 485 1. Assume that only sodium can cross the membrane. The temperature is 24 o C. What is the equilibrium potential? 2. Assume that only potassium can cross the membrane. The temperature is 18 o C. What is the equilibrium potential? 3. Assume that only potassium can cross the membrane. The temperature is 36 o C. What is the equilibrium potential? 4. The transmembrane potential V m is 1 mV and the temperature is 18 o C. Which ion species are NOT in equilibrium? (Allow a small tolerance for round-oF.) 5. The transmembrane potential V m is -60 mV and the temperature is 36 o C. Which ion species are NOT in equilibrium? (Allow a small tolerance for round-oF.) Problem II. Let us assume that the membrane of the cell considered in Problem I is permeable to all
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hmw2 - Due Monday, Jan 31, 2011 BME 201, Spring 2011 -...

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