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Positive and Negative Feedback Loops

Positive and Negative Feedback Loops. A. Negative Feedback. 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. CO 2. O 2.

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Positive and Negative Feedback Loops

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  1. Positive and Negative Feedback Loops

  2. A. Negative Feedback • 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. CO2 O2

  3. Negative Feedback Starting Situation Equilibrium Starting Situation

  4. Example of Negative Feedback

  5. Example of Negative Feedback

  6. Sympathetic Nervous System Parasympathetic Nervous System Fight Or Flight Response Calming return to Equilibrium

  7. 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.

  8. Positive Feedback Explosion No Equilibrium Blocking

  9. Explosion Example of Positive Feedback

  10. Example of Positive Feedback

  11. Liver Releases Glucagon to Raise Blood Sugar Pancreas Releases Insulin to Lower Blood Sugar

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