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.
David Livingstone was born on 19 March 1813 in the mill town of Blantyre, in a tenement building for the workers of a cotton factory on the banks of the Clyde River under the bridge crossing into Bothwell, Lanarkshire, Scotland. The David Livingstone Centre in Blantyre, Scotland, is a museum in his honour. 2  David Livingstone Memorial Primary School in his birthplace, Blantyre, Lanarkshire, Scotland. 3  David Livingstone Memorial Church of the Church of Scotland, in Blantyre, Lanarkshire, Scotland.