Which of the following nutrients is strictly required by the thyroid gland to synthesize the hormone thyroxine?
Iodine
The thyroid gland, located in the neck, makes the hormone thyroxine, which regulates the metabolism of carbohydrates, proteins and fats in the body and so controls growth and the rate at which energy is used.
Each molecule of thyroxine (T4) contains four iodine atoms, so the gland cannot synthesize this hormone without iodine. A lack of iodine in the diet leads to goitre, a swelling of the neck, which is why iodised salt is recommended.
Sodium helps maintain fluid balance and nerve impulses, iron is needed to make haemoglobin in red blood cells, and calcium builds bones and teeth and helps blood clotting; none of these is part of the thyroxine molecule.
Hence, Iodine.
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Important Questions from Human body
A resting person, usually has a pulse rate between ______ and ______ beats per minute
In humans, neck and head are joined by which joint ?
The human skeleton is composed of around ______ bones at birth.
To which of the following organ do the pulmonary arteries supply blood?
The transparent front part of the eye is called:
