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Q 5. The feedback mechanism of hormones allows the balance of the release and the activity of the hormone in the blood/body is maintained. The increase or decrease in the concentration of that hormone can either stimulate the secretion of that particular hormone or inhibit the hormone secretion. This is called feedback.
Q 4. (a). When iodine is deficient, the thyroid gland enlarges, forming a goiter, as it attempts to capture more iodine for the production of thyroid hormones. The thyroid gland becomes underactive and produces too little thyroid hormones (hypothyroidism).
(b).This is primarily the cause of type 1 diabetes. It occurs when insulin-producing cells are damaged or destroyed and stop producing insulin. Insulin is needed to move blood sugar into cells throughout the body. The resulting insulin deficiency leaves too much sugar in the blood and not enough in the cells for energy.
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