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Unformatted text preview: I in g Na+ g K+ C V 4) The current voltage relationship for a sodium ion channel is: I Na + = g Na + V E Na + ( ) The I-V curve of a sodium ion channel generated by a series of voltage-clamp experiments is below: Try to think about five things: a) Are there many sodium channels open when the voltage is very negative? b) When are about all of the sodium channels open? c) Why is the current negative for part of the curve? d) What is the reversal potential for sodium channels? e) For voltage clamps between about 10 mV and +40 mV, why does the current get progressively smaller? + I + V 40 mV-40 mV...
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- Spring '09