Communication and Homeostasis (OCR A-Level Biology A): Flashcards
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Practise the cards
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Definition of negative feedback
Definition of negative feedback
Control mechanism that restores changes back to normal value
Effect of negative feedback on deviation
Effect of negative feedback on deviation
Counteracts the original deviation (self-correcting)
Role of negative feedback in homeostasis
Role of negative feedback in homeostasis
Primary mechanism for maintaining homeostasis
Definition of positive feedback
Definition of positive feedback
Control mechanism causing amplification not regulation
Effect of positive feedback
Effect of positive feedback
Amplifies change, leads to escalation/proliferation
Positive feedback role in homeostasis
Positive feedback role in homeostasis
Not used - creates instability not stabilisation
How positive feedback terminates
How positive feedback terminates
Requires external factor to stop the loop
Positive feedback example in childbirth
Positive feedback example in childbirth
Oxytocin intensifies contractions, more oxytocin released
Result of negative feedback
Result of negative feedback
Stabilisation and control
Result of positive feedback
Result of positive feedback
Proliferation and escalation