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November 27-ch31 - Chapter 31 Body Temperature...

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November 27, 2007 Chapter 31 Body Temperature Regulation “Warm blooded” and “cold-blooded” no longer considered good terms Animals are grouped according to source of body warmth o Endotherms o Ectotherms Endotherms generate body heat through metabolic reactions Maintain constant body temperature Ectoderms derive body heat from environment Occupy a constant environment Behavioral adjustments Reptiles, amphibians, fishes, invertebrates Feedback systems Homeostatic mechanisms that maintain internal constancy are called feedback systems Three parts o Sensor o Control center o Effector Two types of feed back systems o Negative feedback More common Counteracts the effects of changes in the internal environment to maintain homeostasis o Positive feedback Rarer Drive rapid, self-limiting changes The birth process Negative feedback Maintenance of a setpoint Detects deviation form set point via receptor
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