Iodine-Deficiency and Toxicity.

Essay by fidaulHigh School, 12th gradeA-, January 2004

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This essay talks about Iodine. What it does to the body when there is deficiency and toxicity. Why it is important to the body. The essay focuses on different age groups as well. The precautions to take. etc. If you are looking for a grade 12 study report on Iodine deficiency and toxicity then this is for you!


A human body has to intake iodine (which is found in food as iodide) for the proper functioning of thyroid glands related hormones. These hormones are called: thyroxine and tri-iodothyronine - and they are synthesized from the amino acid tyrosine and from iodide. The two hormones are essential for the body mainly because they regulate metabolic rate and promote growth and development throughout the body including the brain. In the case where there is a deficiency of thyroid hormones in the blood, the thyroid gland will become enlarged which is known as goiter.

This deficiency occurs when they thyroid gland does not have enough iodine to make the hormones thyroxine and tri-iodothyronine. Due to the increase of cell size to get more iodine it causes a swelling in the neck when the size of the whole gland increases. Besides from causing in goiter, the deficiency of iodine may also lead to dry skin, hair loss, fatigue, and slowed reflexes. In the developing of a fetus and young child, iodine deficiency in more serious. Stunned growth, diminished intelligence, and retardation may result from the deficiency of iodine in the new born. Vegetarians can be said to be another group that may be at risk of iodine deficiency because they do not eat seafood. However, they receive their iodine from iodized table salt, or seaweeds. Hypothyroidism is another deficiency that occurs when the thyroid gland cannot manufacture enough thyroid hormone because the...