BRAINCAKEExamples of Positive Feedback
When a blood vessel is damaged, blood platelets stick to the damaged region and release chemicals that attract more platelets to the region. At the site of infection, mast cells produce histamine which attracts white blood cells to the region. These in turn secrete chemoattractant cytokines that recruit more white blood cells to the region.
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Key terms in this lesson
- Positive feedback
- A control mechanism in which a change in a factor triggers a response that increases the change further, rather than reversing it.
More in Homeostasis
- Homeostasis
- Feedback Systems
- Endotherms and Ectotherms
- Behavioural Responses in Ectotherms
- Physiological Responses in Ectotherms
- Thermoreceptors
- The Hypothalamus
- Cooling
All 33 lessons in Homeostasis · All OCR A-level Biology topics