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.
He undertook his first expedition to Africa in 1904 to the Kasai district in Congo, formulating the African Atlantis theory during his travels. During World War I in 1916/1917, Leo Frobenius spent almost an entire year in Romania, travelling with the German army for scientific purposes.