define feed back mechanism of hormones
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What is a Feedback Mechanism ?
A feedback mechanism (also referred to as a "feedback system" or a "feedback loop") is a cycle of events in which the state of a specific aspect of the body's condition (called a "controlled condition"), e.g. temperature, iscontinually monitored and adjusted as appropriate to keep the value of that controlled condition within a safe range so that the body continues to function successfully - as opposed to sustaining damage e.g. due to over-heating.
Why are hormone levels regulated by feedback mechanisms ?
The correct (i.e. within an acceptable range) concentration of hormones must be maintained because hormones have powerful effects on the body. Feedback systems are an ideal means of controlling hormone levels because they involve constant monitoring and making adjustments to keep hormone levels stable. That is particularly important in the case of hormone levels because:
Hormones can affect target organs at low concentrations so even a small quantity can sometimes be too much.The length of time during which hormones remain active is limited so more hormones must be secreted as necessary to replace those that are inactivated*.
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