Principles of Homeostasis (AQA A-Level Biology): Flashcards
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Homeostasis definition
Homeostasis definition
Process maintaining stable internal environment despite external changes
Internal environment consists of
Internal environment consists of
Tissue fluids surrounding cells
Enzyme sensitivity to changes in
Enzyme sensitivity to changes in
pH and temperature
Effect of water potential changes on cells
Effect of water potential changes on cells
Cells shrink, expand, or burst through osmosis
Receptor role in homeostasis
Receptor role in homeostasis
Detects deviation from optimum point
Coordinator role in homeostasis
Coordinator role in homeostasis
Processes info and sends instructions to effectors
Effector in homeostasis
Effector in homeostasis
Muscle or gland that brings changes to restore optimum
Negative feedback function
Negative feedback function
Changes turn system off when optimum reached, self-regulating
Positive feedback effect
Positive feedback effect
Deviation causes even greater deviation from normal
Benefit of multiple receptors and effectors
Benefit of multiple receptors and effectors
Greater control precision