Biology 102

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Author:
7tweet7
ID:
51351
Filename:
Biology 102
Updated:
2010-11-23 14:07:25
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Nervous System
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Description:
Chapter 24: Nervous System
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  1. What receives, processes and sends info thru the body quickly?
    Communication
  2. Invertebrate/ Vertebrate Nervous System
    • All animals except sponges have nervous syst.
    • Nerve net (jellyfish)- ladder-like w/ ganglion
    • Flat worm/earthworm- simple brain w/ nerve cord
    • Crab/squid- well defined brain, sense organs
  3. Nervous syst. most complex in vertebrates, highly centralized
    • Cephalization- sensory cells concentrated in head
    • Humans well-developed nervous syst
    • 2 major subdivisions
    • -CNS: brain & spinal cord
    • -PNS: all nervous tissue outside CNS
  4. Nervous tissue: 2 main cell types
    • 1. Nerons: functional unit of nervous syst
    • -dendrites: receive stimuli
    • -Cell body w/ nucleus: processes
    • -Axon (nerve fiber): conducts up to 3'.
  5. 2.

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