sensory reception

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  • selection pressure- favours organisms with better responses
    • A stimulus is a detectable change in the internal or external environment that produces a response in an organism
      • stimuli are detected by receptors
  • stimuli are detected by receptors
  • can be summarised as stimulus- receptor coordinator- effector- response
  • sensory reception
    • Taxes is a simple response. Its direction is determined by the direction of the stimulus
      • a motile organism responds directly to environmental changes
        • it moves its whole body towards a favourable stimulus
          • or away from a unfavourable stimulus
    • animal also use the nervous system
      • each receptor and effector is linked to a central coordinator
      • can be summarised as stimulus- receptor coordinator- effector- response
    • receptors transform the energy from the stimulus into some form of energy
      • effectors carry out the response
    • A stimulus is a detectable change in the internal or external environment that produces a response in an organism
      • kinesis- organism does not move towards or away from a stimulus
        • the more unpleasant the stimulus the more rapidly it moves and changes direction
          • it causes an increase in random movements EG. woodlice
      • Tropism- is a growth movement of part of a plant in response to a directional stimulus
        • the plant grows towards or away from the stimulus

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