2.80 understand how organisms are able to respond to changes in their environment

• Organisms can respond to stimuli for survival.
• Nervous system allows body to respond to stimuli and is coordinated by the brain.
• Organisms also have reflexes (fast, involuntary actions that protect the body from damage).

Factors needed to respond to environment:

Factor	Explanation
Stimuli	Change in environment (internal/external)
Receptor	Specialised cells that detect stimuli
Effector	Part of the body that produced the response