Positive and negative feedback loops
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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
Positive and Negative Feedback Loops


A negative feedback
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


Negative Feedback

Starting Situation

Equilibrium

Starting Situation




Sympathetic nervous system
Sympathetic Nervous System

Parasympathetic Nervous System

Fight Or Flight Response

Calming return to Equilibrium


B positive feedback
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.


Positive Feedback

Explosion

No Equilibrium

Blocking


Example of positive feedback

Explosion

Example of Positive Feedback



Liver Releases

Glucagon

to

Raise Blood Sugar

Pancreas

Releases

Insulin

to

Lower Blood Sugar


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