Introduction to Membrane Potentials 1.Describe the neuron function. Neurons act to facilitate the transfer of data amongst the body’s cells sustaining homeostasis 2.Contrast graded potentials and action potentials. Graded potentials are electrical signals that have variable amplitude, are localized, and travel short distances along the membrane. In contrast, an action potential has a fixed amplitude, and can travel greater distances along the membrane. 3.a. Describe how there can be an electrical change on either side of a membrane thereby generating a membrane potential. The membrane potential is due to the presence of an ionic concentration difference and electrical gradient between both sides of the membrane.movement of charged molecules across the cellular membrane leads to the creation of electrical signals. b….