Bio+I[1] - Biological Foundations I: BRAINS! Bio I Where...

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Biological Foundations I: BRAINS!
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Bio I Where did it all start? Gray matter - Neurons White matter – Glial cells
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Bio I Neuron – the building block; information  processing of CNS
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Bio I 1 single cell with 3 parts: Dendrites Cell body (Soma) Axon
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Bio I 3 general types of neurons: Sensory neurons (Afferent nerves) Motoneuron (Efferent nerves) Interneurons (most populous – 99%) Microcircuitry; Plasticity; Learning
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White Matter Glial cells Made of myelin (myelin sheath). ½ of neuron “material” Nodes of Ranvier Spaces between myelinated areas Accounts for speed in impulse transmission
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Neuron
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How does a neuron work ? Resting potential (-70 mv) Na+ out; K- in Balance maintained by: ion channel and pump Action potential Excitation threshold (-55 mv) Exchange of ions (Na+ and K-) until +40 mv Refractory period Propagation
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Bio+I[1] - Biological Foundations I: BRAINS! Bio I Where...

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