Negative+Feedback+Loop

__George Covarrubias__ __Thyroid Glands and Negative feedback.__ Negative feedback is the process used by the body to regulate chemicals like Thyroid hormone. In the simplest way possible, the hypothalumus releases TRH (Thyroid release hormone). When TRH is secreted, the body produces thyroid hormone (TSH) until the levels of the chemical in the body reach a point that they trigger the secretion of thyroxide. (TH). This other chemical stops the body from secreting thyroid hormone by telling the hypothalumus to stop making TRH. This is a negative feedback loop. The levels of thyroid hormone in the body go down until they no longer meet the levels required for secretion of the inhibitory chemical. Without the presence of the inhibitory chemical, the body begins to secrete thyroid hormone again. In this way, the amount of certain hormones can be kept at constant levels.

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__Possible diseases.__ It is possible for the body to experience Goiter if there is not enough Iodine in the body. This happens because Iodine is one of the chemicals required to make TH. When there is not enough Iodine, the other chemicals that go into making TH begin to pile up in the thyroid. This causes painful swelling. This can be fixed by including some Iodine in your diet.