Exercise 3: Neurophysiology of Nerve Impulses: Activity 1: The Resting Membrane Potential Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. What is the approximate concentration of K+ inside a typical cell (intracellular concentration)?
You correctly answered: a. 150 mM
2. What is the approximate concentration of K+ outside a cell (extracellular concentration)?
You correctly answered: b. 5 mM
3. What is the approximate concentration of Na+ inside a cell (intracellular concentration)?
You correctly answered: b. 5 mM
4. What is the approximate concentration of Na+ outside a cell (extracellular concentration)?
You correctly answered: a. 150 mM
Post-lab Quiz Results
You scored 66% by answering 2 out of 3 questions correctly.
1. A negative membrane potential was recorded when the tip of the microelectrode was
Your answer: b. just inside the cell body.
Correct answer: d. both inside the cell body and inside the axon.
2. Which of the following caused a change in membrane potential from -70 to -40 in the cell body?
You correctly answered: a. an increase in extracellular K+
3. Which of the following has the most negative voltage?
You correctly answered: c. between the inside of the axon and the outside of the axon with control K+ ECF
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