<s>[INST] For a certain excitable cell, the resting membrane potential is–70 mV, the equilibrium potential for potassium (E_k) is–80 mV, and that for sodium (E_Na) is +50 mV. If the membrane is opened to ionic flux at the resting potential, what is the direction of net flux of positively charged ions (sodium or potassium)?[/INST]