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

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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 e 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 •S o dium-potassium pump IV. Action Potential Depolarization epolarization Repolarization Re-establishment of the resting potential Properties: all or none, self-propagating, propagation
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The Nervous System Makes Sense of Everything yy g lmost every conscious and “unconscious” action that Almost every conscious and unconscious action that occurs in your body is governed by the nervous system. • The nervous system must detect stimuli and respond yp while maintaining homeostasis. • How does the body perform these functions? 7-2
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he Nervous System is Categorized by Function and The Nervous System is Categorized by Function and Structure he nervous system has two components: The nervous system has two components: – Central nervous system (CNS) – Peripheral nervous system (PNS) This distinction is based on location.
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This note was uploaded on 07/25/2010 for the course BISC 104LXG at USC.

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

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