The third hormone, calcitonin, is involved in blood calcium homeostasis.
An autoimmune disease involving antibodies against this structure's namesake peroxidase causes destruction of its follicles and is named for Hashimoto. Most of it is located below the cricoid cartilage, but it also extends up the sides. PTH opposes the action of one of the hormones it produces, and iodine and tyrosine are required to produce two others. Deficiency of those two hormones, which are named for it, is known as cretinism in young children. The third hormone, calcitonin, is involved in blood calcium homeostasis. For 10 points, name this butterfly-shaped gland in the lower neck which is enlarged in Graves' disease, creating goiter.
An autoimmune disease involving antibodies against this structure's namesake peroxidase causes destruction of its follicles and is named for Hashimoto.
{thyroid} gland