Flashcards
Homeostasis
Cards in this deck (13)
- 1Homeostasis definition:The maintenance of a constant internal environment in organisms
- 2Negative feedback mechanism definition:A change from the normal level is detected and triggers a response which reverses the change and restores the norm
- 3Stimulus:A change in the environment
- 4Receptor:Detects any deviation from a set point
- 5CoordinatorCoordinates information from receptors
- 6EffectorBrings about changes to return a system to a set point
- 7Responsea change brought about by an effector
- 8Ectotherm:Animals such as reptiles which gain their body heat from the environment
- 9Endotherm:Animals, such as birds and mammals which generate most of their heat from respiration
- 10Regulation of body temperature of ectotherms:Exposure to sun,
sheltering in the shade,
gaining warmth from the ground, generating metabolic heat from respiration
showing colour variations - 11Metabolic activities when the blood temperature of endotherms fall below normal:Vasoconstriction
Hair erector muscles contract
Shivering - skeletal muscles
Brown/White fat
Hormone - adrenaline
Behavioural mechanisms e.g putting on clothes etc. - 12Metabolic activities if the blood temperature in endotherms reaches above normal:Vasodilation
Hair erector muscles dilate
Sweating
Behavioural mechanisms e.g sitting in the shade - 13—
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- A-Level Biology Flashcards on Homeostasis, created by Elena Cade on 21/02/2016.
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- Elena Cade
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