Question
Define ‘hormones’. Name the hormone secreted by thyroid. Write its function. Why is the use of iodised salt advised to us?

Answer

Hormones are complex organic compound which is released endocrine glands in a very small quantity to keep control over growth and development.Thyroid gland secrets thyroxin:
It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones Iodine is needed by the thyroid gland for the production thyroxin hormone. This hormone regulates fat, protein and carbohydrate metabolism in our body If this is in deficient quantity then the neck will swell up due to the enlargement of thyroid gland. This deficiency disease is known as goitre. Therefore the iodized salt is advised.

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