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Negative feedback
restores systems to their original levels
Positive feedback
any response which amplifies a change from the norm
Factors kept constant by Negative feedback
Temperature and pH
Water potential
Glucose concentration
How Temperature and pH can affect the body
changing both can lead to enzyme efficiency being affected or being denatured
how water potential affects cells
can cause them to shrink or expand and burst by osmosis
How glucose concentration can affect the body
affects water potential and provides energy for cells
How oxytocin causes positive feedback
oxytocin, causes contractions which causes pain which stimulates the nervous system to produce more oxytocin which increases contractions further
Note 
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