An individual comes to your clinic complaining of progressiv…

An individual comes to your clinic complaining of progressive muscle weakness of the upper limb. Upon examination you notice the right arm has strength measuring 5/5 (normal) but the left arm has strength measuring (2/5). A muscle tissue sample is surgically obtained revealing the presence of dysfunctional ion channels. This patient most likely has a problem with ____________ that prevents the cell from obtaining peak voltage.