MICROANATOMY

Detailed explanation-1: -Deficiency of iodine in diet results in low secretion of thyroid hormone. Abnormal secretion of thyroxine produces a goitre. It is a condition of enlargement of thyroid gland. To avoid this, one should use iodine salt in the diet.

Detailed explanation-2: -When thyroxine is secreted in lower concentration by the thyroid gland, it leads to a condition called goitre. In goitre, the thyroid gland swells up and a lump appears at the front of the neck.

Detailed explanation-3: -A goiter can occur in a gland that is producing too much hormone (hyperthyroidism), too little hormone (hypothyroidism), or the correct amount of hormone (euthyroidism). A goiter indicates there is a condition present which is causing the thyroid to grow abnormally.