In a neuron (nerve cell), the concentration of k^+ ions inside the cell is about

Question

In a neuron (nerve cell), the concentration of k^+ ions inside the cell is about 20 to 30 times as great as that outside. What potential difference between the inside and the outside of the cell would you expect to measure if the difference is due only to the imbalance of potassium ions? Hint: Calculate the positive potential difference range in volts that is created by the electrolyte concentration gradient across the nerve cell membrane. A standard electrochemical cell is made by placing a silver electrode into a 1.0 M ag+ solution and a cadmium electrode into a 1.0 M cd^2+ solution. What is the redox reaction and what is the maximum potential, E^0 CELL, produced by this cell? Be sure to show half reactions.

Explanation / Answer

Hi,

For the nervous system to function, neurons must be able to send and receive signals. These signals are possible because each neuron has a charged cellular membrane (a voltage difference between the inside and the outside). The charge of this membrane can change in response to neurotransmitter molecules released from other neurons and environmental stimuli. Any voltage is a difference in electric potential between two points; for example, the separation of positive and negative electric charges on opposite sides of a resistive barrier. To understand how neurons communicate, one must first understand the basis of charged membranes and the baseline or

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