nerve system

| December 7, 2015

The Nernst equation (p. 1065 in your textbook) shows that the potassium equilibrium potential (Ek), in a mammalian neuron is -90 mV and that of sodium (ENa) is +62 mV.

1. In a typical human neuron, which ion has the greatest influence on the membrane potential at rest? Explain your answer.

2. What effect would the following changes in extracellular K+ concentration have on the resting membrane potential of a human neuron and on the ease of eliciting an action potential?

a. A change in extracellular K+ from 5 mM to 3 mM?

b. A change in extracellular K+ from 5 mM to 25 mM?
Answer

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