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Homeostasis Chapter 12 Lesson 1
Scenario: ,[object Object],Qn : Why is it risky when we run high temperatures?
Homeostasis ,[object Object],[object Object]
Need for homeostasis Enzymatic chemical reactions in cells sensitive to changes in pH + temperature + water potential drastic changes in composition of blood/surrounding tissue fluid will affect reactions in body
Warm blooded vs Cold blooded animals
Warm blooded
Cold blooded
Homoiothermic vs poikilothermic ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],Homoiothermic vs poikilothermic
IR images of warm blooded animals
IR images of cold blooded animals
 
Homeostatic mechanisms Stimulus  (change in internal environment) Detected by  receptor Self regulatory corrective mechanism Negative feedback Normal condition (norm)
1) Negative feedback ,[object Object],[object Object],[object Object]
Homeostasis through   negative feedback Normal condition (norm) Stimulus (above normal) Stimulus (below normal) Negative feedback Negative feedback Corrective mechanism Corrective mechanism receptor receptor
Another type of feedback called  2)  Positive feedback ,[object Object],[object Object],[object Object],[object Object],[object Object]

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