neuronsslice

Neurons

Neuron Structure 1. Insert an image of the basic neuron structure that includes cell body, dendrites, and axon. p. 249

Myelin Sheath 2. Insert an image of a neuron with a myelin sheath. 3. What is the myelin sheath made of? Where is it located? What is its function? p. 249 4. What is the difference between the "gray matter" and "white matter" in the brain? p.249 5. What causes multiple sclerosis? P.249

Nerve Impulse p.250-252 5. Where are the sodium and potassium ions when the axon is at rest? What is the charge inside the axon?

6. Which ions can cross the membrane and enter the axon? potassium or sodium? 7. What happens to the charge inside the axon when sodium gates open? Where does sodium go? 8. What happens to the charge inside the axon when the potassium gates open? Where does potassium go? 9. Look at the graph on page 251. What do you think depolarization means? What do you think repolarization means? 10. What causes depolarization of the axon? 11. What causes repolarization of the axon? 12. What is an action potential? 13. How does the sodium potassium pump reestablish the resting potential during the refractory period? 14. What is a synapse? 15. What is a synaptic cleft? 16. What is a neurotransmitter? 17. Since neuron's don't touch, how is the signal from one neuron transmitted to another neuron? 18. Insert an image showing an action potential. 19. Insert an image showing a synapse.