Intro chapter 2 ppt skeletons (brain)

Intro chapter 2 ppt skeletons (brain) - Chapter 2...

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Chapter 2 Neuroscience & Biological Foundations
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The Nervous System
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Neurons Neurons are composed of: Cell body (soma) : directs actions of the cell Dendrites : extensions that receive information Axon : extends from cell body, carries electrical potential, sends a chemical message to adjacent neurons via terminal buttons
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The Action Potential
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At rest, the inside of the neuron negative relative due to a higher concentration of positively charged ions outside the neuron. When stimulated, sodium channels open and positively charged sodium ions rush into the axon, depolarization a small region within the axon. The region of depolarization causes nearby sodium channels to open. Just after the sodium channels close, the potassium channels open wide, and potassium exits the axon, repolarizing the tissue just behind the action potential. This process continues as a chain-reaction along the axon. The influx of sodium depolarizes the axon, and the outflow of potassium repolarizes the axon.
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Intro chapter 2 ppt skeletons (brain) - Chapter 2...

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