Answer the following question given this paragraph: 

Figure 12.25 Graded Potentials Graded potentials are temporary changes in the membrane voltage, the characteristics of which depend on the size of the stimulus. Some types of stimuli cause depolarization of the membrane, whereas others cause hyperpolarization. It depends on the specific ion channels that are activated in the cell membrane.


Q: Graded potentials are temporary changes in what, the characteristics of which depend on the size of the stimuli?


A:
membrane voltage