Lecture 4 - Transmission of Electrical Impulse Within a...

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I. Transmission of Electrical Impulse Within a Neuron II. Chemical Communication Between Neurons A. How it Works B. Some Key Neurotransmitters III. Organization of the Nervous System A. Peripheral 1. Somatic 2. Autonomic a. Sympathetic b. Parasympathetic B. Central 1. Spinal Cord 2. Brain
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When a neuron activates, or ‘fires’, it generates an electrical current that travels from the start of the axon ( axon hillock ) and travels to the terminals. The electrical current is caused by movement of charged ions in and out of the axon…
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The electrical current is called an Action Potential. The A. P. follows the “all-or-none law”: - Either the neuron fires or it doesn’t - A. P. is always the same strength A.P. is caused by movement of charged ions in and out of the axon…
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An axon at rest (not firing) … inside of the axon is negatively charged with respect to the outside:
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An axon firing … inside of the axon is now positively charged. Step 1) a change in membrane permeability allows + charged sodium ions to
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This note was uploaded on 09/29/2010 for the course PSYC 2004 at Virginia Tech.

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Lecture 4 - Transmission of Electrical Impulse Within a...

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