sensory reception
- Created by: izzychaloner123
- Created on: 17-02-15 10:17
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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
- A stimulus is a detectable change in the internal or external environment that produces a response in an organism
- 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
- it moves its whole body towards a favourable stimulus
- a motile organism responds directly to environmental changes
- 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
- the more unpleasant the stimulus the more rapidly it moves and changes direction
- 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
- Taxes is a simple response. Its direction is determined by the direction of the stimulus
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