Intracellular sodium concentration of the motor neuron, Biology

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Intracellular sodium concentration of the motor neuron

A complete motor neuron is removed from a frog and placed in normal physiological saline at 1 AM.  The neuron is healthy.  At 2 AM, the physiological saline bathing the neuron is removed and replaced with a modified physiological saline.  The composition of the modified physiological saline is as follows: its potassium concentration is the same as normal physiological saline; its sodium concentration is the same as the intracellular sodium concentration of the motor neuron; its total concentration of solutes (osmolarity) is the same as normal physiological saline.  For this question, ignore any possible effects due to the sodium-potassium pump.  At 2:05 AM, the resting membrane voltage of the neuron is -70 millivolts.  At 2:06 AM,

A. the value of the Nernst equilibrium potential for sodium ions for the neuron is greater than -20 millivolts.

B. an increase in sodium conductance will lead to a decrease in the amount of intracellular sodium.

C. an increase in sodium conductance will lead to no change in the membrane voltage.

 


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