• Nervous system - A communication network that enables a multicellular organism to interact appropriately with its environment. 
  • 2 types of communication network:
  •                 Hormonal - This is limited by diffusion time. Diffusion distance (delta) = sqrt(Dt),                                             where D is the diffusion coefficient.
  •                 Nervous - Conduction velocity of up to 100m/s
  • Examples of communication networks:
  •                Nerve net of a hydra, in which the brain is spread evenly throughout the body.
  •                Earth worm, in which the sensory organs are at the front and ganglia form nerve                         knots at each segment.
  •  …


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