Chapter 27

Chapter 27 - NOTES FOR BIOLOGY 1002 SECTIONS 001 and 002...

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NOTES FOR BIOLOGY 1002 SECTIONS 001 and 002 Spring 2008 DR. STEVEN POMARICO Outline 4A CHAPTER 27 Homeostasis and the Organization of the Animal Body One of the characteristics of life is that organisms establish and maintain an internal environment. Part of this process includes homeostasis . Homeostasis - tendency of life to try and maintain the structure and regulate the internal environment. Life is easier without a lot of changes to deal with. This “maintenance of an internal environment” is a dynamic process which require continual regulation (and energy) How is this done? (See fig 27-1) Negative feedback Positive feedback Negative feedback - a change in one direction causes a series of events in the other direction to counteract the change. Biological example: maintenance of body temperature at 98.6 o F. (37 o C.) Real life example: Your apartment's thermostat. Drop in temp turns on heat, until it reaches set point, then stops.
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Three components of negative feedback 1) set point 2) sensor 3) effector Components Biological Real life Set point Hypothalamus Thermostat setting Sensors Points throughout body Thermometer inside the thermostat Effectors -Shivering -Faster metabolism,
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Chapter 27 - NOTES FOR BIOLOGY 1002 SECTIONS 001 and 002...

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