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Positive and Negative Feedback Loops
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A. Negative Feedback
CO2O2
• 1. Control System that counteracts any change in the body that moves conditions above or below a set point.
• 2. Keeps internal environment stable. (Homeostasis!!)• 3. Shuts off original stimulus or reduces intensity.
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Negative Feedback
Equilibrium
Starting Situation
Starting Situation
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Example of Negative Feedback
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Example of Negative Feedback
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Sympathetic Nervous System
Parasympathetic Nervous System
Fight Or Flight Response Calming return to Equilibrium
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B. Positive Feedback
• 1.Control system that uses information from sensors to increase the rate of change away from set points.
• 2.Not common, only used when rapid change is needed.
• 3.Turns on Stimulus.
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Positive Feedback
Explosion
Blocking
No Equilibrium
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Example of Positive Feedback
MicrophoneAmplifier
Explosion
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Example of Positive Feedback
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Pancreas Releases Insulin
to Lower Blood Sugar
Liver Releases Glucagon
to Raise Blood Sugar
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Positive Feedback
NegativeFeedback