Topic 18 Homeostasis chapt40 rev 1-16-11

Topic 18 Homeostasis chapt40 rev 1-16-11 - Homeostasis in...

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Homeostasis in Animals Chapters 40 Biology 182 Topic XVIII
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Regulation of Internal temperatures Responsible for development of multicellular animals External functions: transport of nutrients and waste and maintenance of ion concentrations. Internal functions: circulation, energy storage, movement, and information processing.
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Homemostasis maintenance of stable conditions in an internal environment. Physiological systems are controlled by the nervous and endocrine systems. Control of systems based on information Feedback mechanism
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Negative Feedback Thermostat Maintaining confortable temperature = set degree When room cools, heater turns on When temperture rises above setting, heater turns off Negative- feedback causes a reverse process i.e. heating reverses cooling trend
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Temperature Ranges O o C – 45 o C: are exceptions < O o C- ice crystal damage > 40 o C- proteins denature etc Aclimatization Through isozymes Contain diff isozymes function at diff temps
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Adaptations Ectotherms Body temps determined by external heat sources Heterotherms= Act like both at diff times Hibernation Summer= endotherm Winter= ectotherm partially Endotherms Body temps determined by internal sources Heat produced metabolically Active heat loss
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Reaction to Temperature Change Lizard: regulates via behavior; moves from shade to sun etc.
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Topic 18 Homeostasis chapt40 rev 1-16-11 - Homeostasis in...

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