BIOL 1F90 Lecture 33: BIOL 1F90 lecture 33 winter 2016
28 Mar 2016
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Document Summary
Typically nerve cell, such as temperature-sensitive cells in the skin. Integrator: compares signals from the sensor to a baseline set point. Often located in the brain and compares input from the sensor to a set point. Effector: compensates for deviations between actual value and set point. Produces a response that compensates for the change induced by the homeostatic challenge. Variable being regulated brings about responses that move the variable in the opposite direction. Decrease in body temperature leads to responses that increase body temperature. May occur at organ, cellular or molecular level. Animal"s body begins preparing for a change in some variable before it occurs. Speeds up homeostatic responses and minimizes deviations from the set point. Many result from, or are modi ed by, learning. Some homeostatic responses may be highly localized ex. neurotransmitters released from one nerve cell travel to an adjacent nerve cell.
