what is feedback mechanism?
Answers
Answer:
the timings and amount of harmones released in required amounts in our body is called feedback mechanism.........
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The endocrine glands secrete hormones depending upon the need of the organism. The amount of hormones secreted should be in an accurate amount. The regulation of the quantity of the hormones and the timing of its release are controlled by feedback mechanisms.
There are two types of feedback mechanisms :-
Positive feedback :- In this mechanism, the response accelerates after the feedback. The effect is further intensified in the same direction. It helps in speeding up the process occurring in various body systems.It is the opposite of negative feedback.
Negative feedback :- In this mechanism, the information given by the feedback causes a reverse response. It occurs when the system needs to slow down or completely stop a process.
For example :
1. Child birth :-
Uterine contractions occur during the onset of labour pain. These contractions stimulate the release of a specific hormone called oxytocin (from the pituitary gland), which intensifies the contractions. The contractions further stimulate the production of oxytocin and this cycle stops only after the birth of the baby.
This is an example of positive feedback...
2. Insulin
When you consume a carbohydrate-rich diet, it is digested into glucose. The glucose is then absorbed by the blood. This results in the increase of blood-sugar level and leads to the stimulation of the pancreas to secrete insulin. Insulin stimulates the target cells to take up the extra glucose from the blood. This glucose is either used during respiration or stored as glycogen. Thus, the level of glucose in the blood is maintained. This is an example of negative feedback.
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