Feedback Mechanisms (AQA A-Level Biology): Flashcards
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Definition of homeostatic control
Definition of homeostatic control
Maintains stable internal conditions via five coordinated components working in sequence
Optimum point in homeostasis
Optimum point in homeostasis
Desired level/normal range system should operate at
Function of receptor in homeostasis
Function of receptor in homeostasis
Detects deviation from set point
Function of coordinator in homeostasis
Function of coordinator in homeostasis
Processes info from receptors & determines response
Function of effector in homeostasis
Function of effector in homeostasis
Carries out corrective actions (muscles, glands, organs)
Negative feedback definition
Negative feedback definition
Corrective measures switch off once optimum reached, preventing overcorrection
Hormone secreted by α cells when glucose is low
Hormone secreted by α cells when glucose is low
Glucagon
Brain region with thermoreceptors for temp control
Brain region with thermoreceptors for temp control
Hypothalamus
Positive feedback definition
Positive feedback definition
Corrective measures remain active, amplifying changes
Hormone in childbirth positive feedback loop
Hormone in childbirth positive feedback loop
Oxytocin