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.
Rosh Hashanah 2015: How to celebrate the Jewish New Year 5776. Synagogues around the world will celebrate the start of Rosh Hashanah this week. The Jewish New Year is one of the most important festivals in the Jewish calendar and is the first of the High Holy Days, which occur in the early autumn in the northern hemisphere. In 2015 year, Rosh Hashanah will begin at sunset on Sunday 13 September and lasts until 15 September. According to the Hebrew or Jewish calendar, a lunisolar calendar used for predominantly for Jewish religious observances, 13 September will bring in the year 5776. From festive meals to synagogue services, Rosh Hashanah is celebrated in a number of different ways.