Survival
Biology: AQA A Level, topic 6.1.1
Responding to Change Increases Survival
Organisms can increase their chance of survival by detecting a change and responding accordingly.
Detecting change
- Organisms can detect changes in:
- External environment (e.g. temperature of surroundings).
- Internal environment (e.g. blood glucose concentration).
Coordinating responses
- Coordinating a response to the environment involves three components:
- Stimulus - change in the environment.
- Receptors - detect the change in the environment.
- Effectors - initiate the response.
Test yourself on Survival
Which of these is NOT a factor that coordinates a response to the environment?
Which of the following statements about responding to change are true?