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Feedback
Mechanisms
AQA Unit 5 Biology
Frihah Parvaiz

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Principles
Negative feedback restores systems to their original level.




The of negative
in different directions from the original state, giving a of




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Positive results in greater from the original


Positive is often with a of control in













Candidates should be able to interpret diagrammatic representations of negative and positive feedback.




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Control of mammalian oestrus
The mammalian oestrous cycle is controlled by FSH, LH, progesterone and oestrogen.




Candidates should be able to interpret graphs showing the blood concentrations of FSH, LH, progesterone
and oestrogen during a given oestrous cycle. Changes in the ovary and uterus lining are not required.




Summary of…

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Illustrations of the stages in the menstrual cycle




Stages in the menstrual cycle




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The secretion of FSH, LH, and oestrogen is
controlled interacting negative and positive




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Feedback
Mechanisms

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Feedback
Mechanisms

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