Stimulate a neuron and monitor what happens. Pause, rewind, and move forward in time in order to observe the ions as they move across the neuron membrane. • Describe why ions can or cannot move across neuron membranes. • Identify leakage and gated channels, and describe the function of each. • Describe how membrane permeability changes in terms of different types of channels in a neuron. • Describe the sequence of events that generates an action potential.