Iodine deficiency causes this organ to increase in size.
Malfunction of this organ in utero can result in cretinism if it goes untreated after birth. Underactivity of this organ in utero can result in Hashimoto's disease, and (*) Graves's disease results from hyperactivity of it. This organ stimulates resorption of calcium by producing calcitonin. This organ's namesake peroxidase helps the body use tyrosine to produce its T4 and T3 hormones. Iodine deficiency causes this organ to increase in size. For 10 points, name this endocrine gland which, when enlarged, becomes a goiter.
Malfunction of this organ in utero can result in cretinism if it goes untreated after birth.
{thyroid} gland