Lecture 26 - Bio 93 Fall 2009 Lecture 26 Nervous System I...

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Reading: Chapter 48, pages 1047-1056 Bio 93 Fall 2009 Lecture 26 Nervous System I Monday 11/30/09 NOTES on FINAL
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Fun Facts about the Brain Usually 1 brain/person, weight about 2.5 lbs. About 1/2 cup cerebrospinal fluid (outside/inside) About 1,000,000,000,000 (10 12 ) neurons/brain --each with thousands of inputs, up to 150,000 --each separated from all by 6 deg separation --approximately 20 glial ('helper') cells/neuron --each with diameter = 8 - 80 μ m 100,000 miles of axons/brain, conduct 200 MPH Brain uses 20% of body's blood flow and energy 25% of human genes are expressed in the brain Brain's blood delivered via 400 miles of pipes Society for Neuroscience: http://www.sfn.org/index.aspx?pagename=brainFacts&section=publications
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Information Processing Nervous systems process information in three stages: Sensory input, integration, and motor output
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Structure of a neuron Think structure/function Highly specialized organization
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Different types of neurons
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All cells have a membrane potential.
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