The primary function of the thyroid is the production of the iodine-containing thyroid hormones, triiodothyronine (T3) and thyroxine (T4) and the peptide hormone calcitonin. 1  T3 is so named because it contains three atoms of iodine per molecule and T4 contains four atoms of iodine per molecule.
Explorations of Africa. In the official role of a medical missionary, he set forth to Africa, arriving in Cape Town, South Africa in March of 1841. A few years later, he married Mary Moffat; the couple would have several children.
And in 1815 he did take 38 colonists from America to Sierra Leone, a British colony on the west coast of Africa. Cuffee's voyage seems to have been an inspiration for the American Colonization Society, which was officially launched at a meeting at the Davis Hotel in Washington, D.C. on December 21, 1816.