One of the roles of iron in the human body is to: Promote the breakdown of older

Question

One of the roles of iron in the human body is to: Promote the breakdown of older bones. provide structural rigidity to proteins. transport oxygen and carbon dioxide in the blood. help in the elimination of water. _is a protein complex that stores iron and releases it only when it is needed. Transferrin Ferritin Hemoglobin Myoglobin Which of the following statements is true of iodine? It is a component of amino acids such as cysteine and methionine. It is absorbed mostly in the large intestine. It is present in low concentration in ocean fish and mollusks. It is essential to the production of hormones by the thyroid gland. Which of the following statements is true of fluoride? Almost all of fluoride consumed is absorbed by the large intestine. The gastrointestinal tract heavily regulates fluoride's absorption. Fluoride is a major mineral required by the body. Excess fluoride is excreted in the urine. Shellfish poisoning occurs because: shellfish produce a toxin called aflatoxin

Explanation / Answer

51. Heme is the component of hemoglobin and most predominant iron-containing substance. hemoglobin is involved in the transport of oxygen and the carbon dioxide in the blood.

Hence, the correct answer is the option (c).

52. The iron(Fe+2) entering the mucosal cells by absorption is oxidized to ferric form (Fe+3) by the enzyme ferroxidase. The Fe+3 then combines with apoferritin to form ferritin which is the storage form of iron. From the mucosal cells, iron may enter the blood stream which mainly depends on the body needs or lost when the cells are desquamated.

Hence, the correct answer is the option (b).

53. Iodine is essential for the synthesis of thyroid hormones namely, thyroxine (T4) and triiodothyronine (T3). These hormones are involved in several biochemical functions. More than half fo the body's total iodine content is found in the thyroid gland.

Hence, the correct answer is the option (d).

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