The figure shows a neuron from an animal’s brain with the following labeled:
● potassium (K+) ion concentrations (measured in mM) inside and outside the animal neuron
● membrane potential (-70 mV)
● K+ channel
a) At rest, there is net movement of K+ ions out of the neuron through the K+ channel (as indicated by the arrow). During an experiment, the animal begins experiencing depressed neurological function and falls into a coma. A review of the data from the experiment indicates that these neurons were generating fewer action potentials than normal. Also, K+ was moving INTO the neuron instead of out.
What could have changed to cause net movement of K+ INTO the neuron? Identify as many ways as you can.
b) Explain how the ways you identified above cause K+ to move INTO the neuron.
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