9.1 sensory reception
- Created by: laurenhemsley2
- Created on: 18-04-15 14:10
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- Stimulus and response
- Sensory reception
- Tropisms
- A tropism is a growth movement of a part of a plant in response to a directional stimulus.
- Grows towards= positive grows away= negative
- Example: plant shoot grows towards light (positive phototropism)
- Tropisms
- A stimulus is a detectable change in the internal or external environments of an organism that causes an immune response
- Receptors transform the energy of a stimulus into some form of energy that can be processed by the organism and lead to a response.
- The response is carried out by one or more of a range of different cells, tissues, organs and systems. These are known as effectors.
- One way is hormones which are relatively slow
- A more rapid way found in animals is the nervous system
- Sensory reception
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