Resting membrane potential


Q.

The figure shows part of a neuron with the following labeled:
● Sodium ion (Na+) and potassium ion (K+) concentrations (measured in mM)
● Resting membrane potential (-70 mV)
● Na+ channels (black boxes) and K+ channels (gray boxes)

The resting membrane potential of a neuron is -70 mV.  At rest a neuron has many more open K+ channels than open Na+ channels. However, at this time the rate of K+ moving out of the neuron is equal to the rate of Na+ moving into the neuron. Explain how K+ and Na+ can be moving across the membrane at the same rate if there are many more open K+ channels than open Na+ channels?

 

Resting membrane potential

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Undergraduate

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Question Instructions

We recommend that you administer these questions as homework and preface the question with these instructions for students:

"For the following question, please respond to the best of your knowledge and using only the information in the question and what you know. Please do not refer to any outside sources (textbooks, notes, internet, etc.). Any reasonable attempt to answer the question will be awarded full credit."

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