positive and negative feedback loops
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Positive and Negative Feedback Loops
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.
Negative Feedback
Equilibrium
Starting Situation
Starting Situation
Example of Negative Feedback
Example of Negative Feedback
Sympathetic Nervous System
Parasympathetic Nervous System
Fight Or Flight Response Calming return to Equilibrium
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
Blocking
No Equilibrium
Example of Positive Feedback
MicrophoneAmplifier
Explosion
Example of Positive Feedback
Pancreas Releases Insulin
to Lower Blood Sugar
Liver Releases Glucagon
to Raise Blood Sugar
Positive Feedback
NegativeFeedback