Essential for the metamorphosis of a tadpole to a frog, it is released in greater amount in the cold.
Essential for the metamorphosis of a tadpole to a frog, it is released in greater amount in the cold. Isolated by Edward Calvin Kendall and 1st synthesized by Charles Harington, it is secreted as a plasma globulin and is made from diiodotyrosine. Over production results in the tremor, appetite, and fatigue of Grave's disease, and under production causes myxedema in adults and cretinism in children. Converted to T3 in cells, its production is regulated by TSH. For ten points, name this hormone that increases the rate of metabolism, secreted by the thyroid gland.
Essential for the metamorphosis of a tadpole to a frog, it is released in greater amount in the cold.
thyroxine; or tetraiodothyronine or T4