Problem
1. Describe the operation of the sodium-potassium pump. What role does the pump play in maintenance of the resting membrane potential? Why does the pump require energy (ATP)?
2. Describe the propagation of the nerve impulse along the axon in terms of the movements of ions. What effect does myelin have on the speed of impulses traveling down the axon?
3. What is a graded potential? What types of channels are involved in generating graded potentials? Under what circumstances does a graded potential lead to an action potential?