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PEX-03-01 - Exercise 3 Neurophysiology of Nerve Impulses...

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Exercise 3: Neurophysiology of Nerve Impulses: Activity 1: The Resting Membrane Potential Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 12/07/11 page 1
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12/07/11 page 2 Experiment Results Predict Question: Predict Question: Predict what will happen to the resting membrane potential if the extracellular K+ concentration is increased. Your answer : b. The resting membrane potential will become less negative. Stop & Think Questions: What is the polarity of the resting membrane potential (voltage)? Your answer : a. positive Correct answer: b. negative What does it mean that the voltage just inside the membrane is negative? Your answer : a. There are exactly the same number of positive charges and negative charges just inside the membrane. Correct answer: b. There are more negative charges than positive charges just inside the membrane. The membrane of most cells, including neurons, contains passive, open, K+ leak channels. Given the normal K+
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