Zoology - Chemical Coordination and Integration Question with Solution | TestHub

Goitre is increase in the size of thyroid gland. Deficiency of iodine in diet can cause endemic goiter. In endemic goiter, the level of thyroid hormones decrease. This sends a negative feedback to pituitary which releases TSH. This acts on the follicular cells and they produce more thyroglobulin causing goitre. Grave's disease or exophthalmic goiter occurs due to excessive activity of the thyroid gland leading to hyperthyroidim