Which of the following physiologic processes best exemplifies a positive feedback mechanism?
A) The increase in prolactin secretion that occurs with more frequent breast-feeding
B) The regulation of blood glucose levels by insulin
C) The release of parathyroid hormone in response to decreased serum calcium levels
D) The release of antidiuretic hormone when sodium levels are higher than normal
Ans: A
Feedback:
A positive feedback mechanism occurs when one hormonal or physiologic factor stimulates further hormonal release, creating a cascade that will increase until corrected. Correction of alterations in homeostasis is normally achieved using negative feedback mechanisms, such as those accomplished by insulin, parathyroid hormone, and ADH.
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