1. NERVE IMPULSE TRANSMISSION
OBJECTIVES:
4. Explain how nerve impulses are generated and how they are conducted
along a nerve fiber (pp. 877 – 879)
5. Describe the mechanism of nerve impulse transmission at the synapse.
(pp. 877 – 879)

2. I. Neuron at rest Outside is Positively charged due to Na+ ions.
Inside is negatively charged due to Nucleic Acids and Proteins

3. II. When the neuron is stimulated
NA+ rushes in and creates the “Action Potential”
The inside is now positive(Action Potential). AP
Action Potential

4. III. How does the neuron reset itself?
Reset Charge:
K+ exits neuron AP
Action Potential

5. III. How does the neuron reset itself?
Reset Ions
K+ / Na+ pump resets the ions back to normal
Action Potential

9. What happens:
1. Impulse reaches end bulb
2. Ca2+ channels/gates open and Ca2+ enters
3. Vesicles migrate and fuse with membrane
4. Neurotransmitter released into Synapse 5. Neurotransmitter binds to receptors on adjacent neuron, causes it to depolarizes

10. Transmission Across a synapse Lab
Obtain a microscope and slide
On your paper, draw a picture of your slide on 400 power.
Find the neuron and label the following parts on your picture:
Axon
Presynaptic neuron
Vesicles
Postsynaptic muscle

12. Questions
What causes the vesicles in the neurons end bulb to release its contents?
What carries the nerve impulse across the synapse?
What is another name for a nerve impulse?