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Homeostasis and Feedback Mechanisms


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homeostasis
The ability of the body to maintain a stable state (temperature, water level, etc.) despite changes in the environment
feedback mechanism
A system where a product feeds back control to its own production
negative feedback
Feedback where a product shuts off its own production
negative feedback loop
A feedback system that works to maintain a "normal" status. (ex. thermoregulation, blood glucose regulation)
positive feedback
Feedback where a product increases its own production
positive feedback loop
A feedback system that works to amplify an effect. (ex: labor, fruit ripening)
thermoregulation
Maintaining a stable temperature
stimulus
A change in the environment that triggers a reaction
receptor
Detects a change in the environmnet and sends a signal to the control center
control center
Receives a signal from a receptor and coordinates a response
effector
The cells/organ that respond to the output from the control center
response
The reaction to a stimulus
glucose
Sugar that the body uses for cellular respiration
insulin
Hormone that increases the amount of glucose taken into body cells, decreasing blood glucose levels
glucagon
Hormone that triggers the breakdown of glycogen (polymers of glucose), increasing blood glucose levels
glycogen
Polymers of glucose, stored in the liver
pancreas
Organ that produces and releases insulin and glucagon into the bloodstream