1.Suppose extracellular [K+] increases by 2.5 mM. If the original extracellular [K+] was 5 mM, how large (and in what direction) is the change in EK ?

2. Suppose extracellular [Na+] increases by 2.5 mM. If the original [Na+] was 145 mM, how large (and in what direction) is the change in ENa? Does EK change?

3. Compare the change in EK to the change in ENa when either external K+ or Na+ is increased by 2.5 mM. Why are the values so different?