ch.7.1 - Ch 7 The Nervous System Neurons and Bioelectricity...

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Ch 7. The Nervous System Neurons and Bioelectricity 9/19/08 I. Organization of the Nervous System Central nervous system: brain, spinal cord Peripheral nervous system: somatic, autonomic (sympathetic and parasympathetic) II. Neurons and Glia Ne rons: sensor interne rons motor Neurons: sensory, interneurons, motor Glia: Schwann cells (myelin sheath in PNS), Oligodendrocytes (myelin sheath in CNS), Astrocytes (modulating synaptic function), Microglia (scavenger) III. Resting Potential Ion gradients Selective permeability di i Sodium-potassium pump IV. Action Potential Depolarization Repolarization Re-establishment of the resting potential Properties: all or none, self-propagating, propagation
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