The figure shows a neuron with the following labeled:
- Sodium ion (Na+) and potassium ion (K+) concentrations (measured in mM)
- Membrane potential (-70 mV)
- Glutamate receptor with glutamate bound
The glutamate receptor is a channel that allows both Na+ and K+ to move across the membrane with equal permeability. What happens to the membrane potential of the neuron when the glutamate receptor opens and the channel is equally permeable to both Na+ and K+?
a. It will become more positive than -70 mV.
b. It will become more negative than -70 mV.
c. It will stay the same at -70 mV.
Explain your reasoning about what happens to the membrane potential when the glutamate receptor opens and the channel is equally permeable to both Na+ and K+.
Topics:Ion movement, Physiology
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