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Ch 48: Nervous System – part 1

Ch 48: Nervous System – part 1. A nervous system has three overlapping functions regarding information processing:. 1) INPUT : signals from sensory receptors to integration centers 2) INTEGRATION : information from sensory receptors is interpreted and associated with appropriate responses

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Ch 48: Nervous System – part 1

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  1. Ch 48: Nervous System – part 1

  2. A nervous system has three overlapping functions regarding information processing: 1) INPUT: signals from sensory receptors to integration centers 2) INTEGRATION: information from sensory receptors is interpreted and associated with appropriate responses 3) MOTOR OUTPUT: conduction of signals from the integration center to effector cells (muscle cells or gland cells)

  3. All animals except sponges have some type of nervous system • Greater complexity & behavior evolved with cephalization

  4. *CENTRAL NERVOUS SYSTEM (CNS) • brain and spinal cord • integration center Simplest CNS

  5. *PERIPHERAL NERVOUS SYSTEM (PNS) • made up of nerves (ropelike bundles of neurons) • nerves communicate motor and sensory signals to and from CNS and rest of body

  6. Two Main Classes of Cells: 1) NEURONS:  functional unit of the nervous system  transmits signals from one location to another  made up of: dendrites, cell body, axon hillock, axon, synaptic terminal  many axons are enclosed by an insulating layer called the MYELIN SHEATH • include: sensory neurons, interneurons (relay neurons), motor neurons

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