BRAINCAKENegative Feedback
Negative feedback is a mechanism in which a change from the set point triggers a response that reverses the change, bringing the variable back towards the set point. It is the basis of almost all homeostatic control.
Once the variable returns to the set point, the stimulus is removed and the corrective response is switched off. The variable therefore fluctuates slightly above and below the set point rather than staying perfectly fixed.
Example: body temperature
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Key terms in this lesson
- vasodilation
- Widening of a blood vessel, which increases blood flow through it.
- vasoconstriction
- Narrowing of a blood vessel, which decreases blood flow through it.
More in Chemical Control
- Homeostasis
- Feedback Systems
- Positive Feedback
- Chemical Control
- Endocrine Glands
- Hormone Release System
- Pituitary Gland
- Second Messenger System
All 30 lessons in Chemical Control · All Edexcel A-level Biology topics