Biology A-Level
Positive feedback
What Positive feedback means in Biology A-Level, as defined for OCR.
Definition of Positive feedback
Check what you remember
Read the wording for your board, then hide it and explain Positive feedback in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: OCR
A mechanism that amplifies a change and is rare, occurring in specific events such as certain stages of childbirth.
Topics that use Positive feedback
- Communication and homeostasis (OCR A-Level)
Related terms
- cell specialisation
- Local versus long-distance signalling
- Negative feedback pathway
- Nervous and endocrine coordination
- Optimal conditions for cell function
- Surface area to volume ratio and diffusion limits
- Target cell response
- Thermoregulation in ectotherms
Using Positive feedback in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
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