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Best example of positive feedback is the release of oxytocin during childbirth. Oxytocin is a reproductive hormone in females. Though it is also secreted in males, its function is yet unclear.
Even the physiological response to the hormone can feedback and affect target organs. This whole feedback loop is negative, but it can also be ostive. So, if hormone levels drop, or if stress increases, or diet changes, there will be a change in physiological response that will make feedback positive or negative to affect the hypothalamus. How do feedback mechanisms control hormone production?