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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.

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Presentation on theme: "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."— Presentation transcript:

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). Action Potential AP

4 III. How does the neuron reset itself? 1)Reset Charge: K + exits neuron Action Potential AP

5 III. How does the neuron reset itself? 2)Reset Ions K + / Na + pump resets the ions back to normal Action Potential

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9 What happens: 1. Impulse reaches end bulb 2. Ca 2+ channels/gates open and Ca 2+ 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 1)Obtain a microscope and slide 2)On your paper, draw a picture of your slide on 400 power. 3)Find the neuron and label the following parts on your picture: – Axon – Presynaptic neuron – Vesicles – Postsynaptic muscle

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12 Questions 1)What causes the vesicles in the neurons end bulb to release its contents? 2)What carries the nerve impulse across the synapse? 3)What is another name for a nerve impulse?


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