Thyroid hormones (T 4 and T 3) are produced by the follicular cells of the thyroid gland and are regulated by TSH made by the thyrotropes of the anterior pituitary gland. The effects of T 4 in vivo are mediated via T 3 (T 4 is converted to T 3 in target tissues). T 3 is 3- to 5- fold more active than T 4.
May is Jewish American Heritage Month The Library of Congress, National Archives and Records Administration, National Endowment for the Humanities, National Gallery of Art, National Park Service and United States Holocaust Memorial Museum join in paying tribute to the generations of Jewish Americans who have helped form the fabric of American history, culture and society.
Why? Because the Jewish year 5776 (the spring months of 2016 fall within the Jewish year 5776) happens to be the 19th year of the 19-year calendar cycle and is then, by Judaic definition, a leap year (the 13th month must be added). This forces the first month to begin one month later than it normally would.