Draw the membrane voltage changes that occur during a typical action potential. Make sure to label the restingmembrane voltage (VR), equilibrium potential of Na+ (ENa+) and K+ (Ek+), and the action potential threshold (T).Label the following phases of the action potential: Resting Potential, Rising Phase, Falling Phase, Undershoot, andReturn to Resting Potential. Assume the following ion concentrations:Inside the cell: 10 mM Na+; 100 mM K+Outside the cell: 100 mM Na+; 10 mM K+Relative Conductance of Nat: 1; Relative Conductance of K+: 9

Answered: Draw the membrane voltage changes that…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

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Draw the membrane voltage changes that occur during a typical action potential. Make sure to label the resting
membrane voltage (VR), equilibrium potential of Na+ (ENa+) and K+ (Ek+), and the action potential threshold (T).
Label the following phases of the action potential: Resting Potential, Rising Phase, Falling Phase, Undershoot, and
Return to Resting Potential. Assume the following ion concentrations:
Inside the cell: 10 mM Na+; 100 mM K+
Outside the cell: 100 mM Na+; 10 mM K+
Relative Conductance of Nat: 1; Relative Conductance of K+: 9

Expert Solution

Step 1

The action potential starts when the membrane potential of the cell reaches the threshold. The rising phase is the increase in the potential from negative to positive which reaches the maximum positive value (overshoot) followed by falling phase when the potential again starts to decrease, reaches undershoot which is more negative than the resting potential. This is further followed by return to te resting potential.

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