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.
Yom Kippur, which in 2016 begins at sundown October 11, and lasts until sundown October 12, is one of the most serious Jewish holidays. Jews who do not regularly observe other holidays often make an exception for Yom Kippur, which occurs on the tenth day of the Hebrew month of Tishri. Yom Kippur observances can vary.