Question

What is feedback mechanism? Give an example of each positive and negative feedback mechanism?

Answer 1

Any variation in the body from set point
(homeostasis)can be harmful for the body, to correct this variation either by increasing or decreasing the set point is known as feedback.

Types...
1.positive feedback
2.negative feedback

Positive feedback.
positive feedback is used to amplify the change(variation)

Example.
The application of positive feedback is during childbirth. it causes the release of oxytocin to contract the walls of uterus , contractions causes more and more oxytocin to be released to cause more pressure until the child birth occurs.

Negative feedback.
negative feedback reverses the direction of change.

Example.
when body is deficient of water Hypothalamus stimulates the pituitary gland to release ADH. ADH works on the ducts of nephron to reabsorb water. when the level of water becomes balance in the body the release of ADH is inhibited by the pituitary gland.

Answer 2

Feedback Mechanism is defined as the mechanism by which the timing and the amount of hormone released is regulated by the feedback taken from the substrate present in the blood...

e.g. When the pancreatic cells detect high level of sugar in the blood, they secrete insulin. When the amount of blood-sugar decreases, they stop releasing insulin...

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