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Biology Revision:

Homeostasis ­ maintaining internal conditions within narrow limits
Usually involves ­ negative feedback,
Effectors ­ are either muscles or glands, they bring about response
to a stimulus
Receptors ­ detect stimuli e.g. thermo receptors
Negative Feedback ­ departure from a set level is detected by
receptors. These…

Page 2

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Hot and cold thermo-receptors in the skin send nerve impulses to
the hypothalamus which brings about the changes necessary to
restore the correct temperature.


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