1. What are the two divisions of the nervous system?
____________________________ and ______________________________
2. What are the three functions of the nervous system?
_______________________ _______________________ ______________________

3. Describe a neuron: __________________________________________________________

4. What are the two types of motor functions of the nervous system?
___________________________________ and ________________________________'

5. What is the function of the Schwann cells? _______________________________________
6. List two jobs that neuroglial cells perform:
_________________________________ ____________________________________
7. What would happen to an infant whose nerve fibers did not myelinate properly?
_________________________________________________________________________
8. Sketch a neuron and label at least 4 structures

9. How are neurons classified? (name the 3 groups)
_____________________ _______________________ ___________________
10. What is the function of sensory neurons? _____________________________________
11. What is the difference between a resting potential and an action potential?
________________________________________________________________________
12. What two molecules are necessary for the action potential (causing polarization and depolarization) _________________________________________

13. Place the events in the correct order
_______ Potassium channels open
_______ Wave of action potentials travel the length of the axon as a nerve impulse
_______ Bioelectric current stimulates the membrane
_______ Sodium channels open
_______ Threshold stimulus received

14. What is a node of Ranvier? _________________________________________________
15. What is the "all-or-none" response? ___________________________________________