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PNS PERIPHERAL NERVOUS SYSTEM

PNS PERIPHERAL NERVOUS SYSTEM. Pages 433-435 VOLUNTARY PNS INVOLUNTARY PNS. Voluntary PNS. made up of voluntary SOMATIC nerves - a.k.a. voluntary SENSORY & MOTOR neurons under CONSCIOUS control how you relate with the EXTERNAL environment. Involuntary PNS.

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PNS PERIPHERAL NERVOUS SYSTEM

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  1. PNS PERIPHERAL NERVOUS SYSTEM Pages 433-435 VOLUNTARY PNS INVOLUNTARY PNS

  2. Voluntary PNS • made up of voluntary SOMATIC nerves - a.k.a. voluntary SENSORY & MOTOR neurons • under CONSCIOUS control • how you relate with the EXTERNAL environment

  3. Involuntary PNS • also called the Autonomic Nervous System (the ANS) • made up of autonomic (“automatic”) nerves to your internal glands & organs (heart, lung, liver, etc.) • Unconcious • divided into the: • SYMPATHETIC NERVOUS SYSTEM =stress system! “fight or flight”! =adrenaline! • PARASYMPATHETIC NERVOUS SYSTEM =think PARAmedic keeping you normal / at homeostasis =“rest & digest”

  4. PNS: SENSORY RECEPTORS • highly modified structures on the dendrites of sensory neurons • Examples • skin receptors: pain, temp., pressure, etc. (see handout) • nose (called olfactory receptors) • tongue (“tastebuds”) • *eyes: photoreceptors • *ears: hearing & balance receptors

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