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.
In 1802 Fulton contracted with Robert Livingstone to build a steamboat that would ply the Hudson River. Livingstone held the rights for steamboat navigation on the waterway. By August 1807, Fulton's boat was ready for a trial run from New York City to Albany and back. On the afternoon of Monday August 17, the vessel was moored on the East River off Greenwich Village. Aboard were Fulton, Livingston and numerous adventurous friends eager to make the historic voyage. The boat (called the Clermont by history although there is no evidence that Fulton used this name) was an odd looking craft 150 fifty feet long and 13 feet wide, drawing 2 feet of water.