Nervous Systems
Campbell Chapter 44

1. Explain each of the three general functions of a nervous system and the type of neuron responsible for each.

2. Be familiar with the structure of a myelinated neuron. Describe the function or importance of each part.

3. Describe a reflex arc. How is the impulse relayed from one neuron to the next?

4. Describe and account for the difference in the speed of transmission of a nerve impulse in a myelinated axon vs. an unmyelinated axon.

5. Explain the origin of the membrane potential.

6. With reference to the gated ion channels, outline the events associated with the action potential, from resting potential to the restoration of resting potential

7. How is the action potential propagated along a neuron?

8. What is meant by "threshold potential?"

9. What is the refractory period and why is it important?

10. Although the action potential is an all-or-none event, you are able to distinguish a wide range of stimuli. How is this possible?

11. In a chemical synapse, how does the action potential cross the synaptic cleft?

12. How can the same neurotransmitter have an excitatory effect on some postsynaptic neurons and an inhibitory effect on others?