Chapter_27-_Homeostasis

Chapter_27-_Homeostasis - Chapter 27 BIO 1002 Chapter 27:...

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Chapter 27 BIO 1002 2/26/2008 Chapter 27: Homeostasis and the Organization of the Animal Body I. Homeostasis: - The tendency of all living things to maintain their structure and regulate their internal environment (the body continually adjusts to internal and external changes) o ex: In general body temperature A. Negative Feedback: - A change in one direction causes a series of events in the other direction to counteract the change - Example: - Biological: body temperature of 37 degrees Celsius or (97.6 degrees F) - Physical: changing house thermostat (turns itself on and off) - Called negative feedback b/c it turns on and off - Figure 27-1a: a negative feedback all about sensors and effectors (hypothalamus senses whether you are cold (shivering/ hair standing up) or hot) muscle structures work similarly to the action of rubbing your hands together - Negative because working against change B. Positive Feedback: - Initial change in one direction sets off a series of events that intensifies a change in that same direction
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This note was uploaded on 09/22/2009 for the course BIOL 1002 taught by Professor Pomarico during the Spring '08 term at LSU.

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Chapter_27-_Homeostasis - Chapter 27 BIO 1002 Chapter 27:...

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