Problem set 1-2008

Problem set 1-2008 - Problem set 1 Name _ BISC 421 2008...

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Problem set 1 Name ________________________ BISC 421 2008 (covers material from the September 3 rd th lecture) 1. Suppose a water-filled aquarium is divided into two compartments by a membrane that is impermeable to all ions. If KCl is added to one compartment, what will happen to the distribution of ions? Is there a potential difference between the two compartments? What will happen to the membrane potential if the membrane suddenly becomes selectively permeable to K + (but not to Cl )? What would happen if you then added NaCl to one compartment only? 2. Suppose you are recording a neuron’s resting membrane potential. If you added KCl to the external medium, what would happen to the resting potential? Compare this to what would happen if you had added the same amount of NaCl. What can you conclude from this comparison?
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3. How much does the resting potential of the squid axon change when the concentration of external K + is reduced from 20 mM to 2 mM? Why? 4.
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Problem set 1-2008 - Problem set 1 Name _ BISC 421 2008...

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