An important example of a negative feedback loop is seen in control of thyroid hormone secretion. ... Conc of prolactin acts negatively on PRH and postively on PIH forming negative feedback loop. As discussed shortly, it triggers the secretion of thyroid hormones by the thyroid gland. Feedback mechanism – A process that uses one component to regulate another, either through positive or negative feedback. In a negative feedback loop, increased output from the system inhibits future production by the system. Feedback circuits are at the root of most control mechanisms in physiology, and are particularly prominent in the endocrine system.Instances of positive feedback certainly occur, but negative feedback is much more common. Feedback Loops. Short loop feedback generally refers to a pituitary hormone providing negative feedback to the hypothalamus, inhibiting secretion of the releasing hormone. Instances of positive feedback certainly occur, but negative feedback is much more common. The image above shows the locations of the hypothalamus and pituitary glands in the human brain. The pituitary gland is stimulated by TRH of hypothalamus to release thyroid-stimulating hormone (TSH). Growth hormone secretion is also part of a negative feedback loop involving IGF-I. Regulation of the Male Reproductive System. An important example of a negative feedback loop is seen in control of thyroid hormone secretion. An increase in gonad hormone levels inhibits GnRH production through a negative feedback loop. They provide the controls needed to keep the effects of hormones and hormone chain reactions from spiraling out of control. Human Growth Hormone (HGH) Explained by Anthony Roberts. An important example of a negative feedback loop is seen in control of thyroid hormone secretion. Feedback circuits are at the root of most control mechanisms in physiology, and are particularly prominent in the endocrine system. To investigate the mechanisms of the negative feedback inhibition of growth hormone (GH) secretion by IGF-I, we studied parameters of GH pulsatility in six normal, fed men before and during a 48-h infusion of recombinant human IGF-I (rhIGF-I) (10-15 micrograms/kg per h). The TSH, in turn, stimulates the thyroid to produce thyroid hormone until levels in the blood return to normal. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Growth Hormone. This mechanism allows the release of the oxytocin hormone when a trigger occurs. Because negative feedback mechanisms attempt to maintain a target level, these are the most common type of feedback mechanisms employed by your endocrine system. Negative feedback (or balancing feedback) occurs when some function of the output of a system, process, or mechanism is fed back in a manner that tends to reduce the fluctuations in the output, whether caused by changes in the input or by other disturbances..