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.
Tisha B'Av is an annual fast day in Judaism, on which a number of disasters in Jewish history occurred, primarily the destruction of both the First Temple by the Babylonians and the Second Temple by the Romans in Jerusalem. Tisha B'Av is regarded as the saddest day in the Jewish calendar and it is thus believed to be a day which is destined for tragedy. Tisha B'Av falls in July or August in the Western calendar. The observance of the day includes five prohibitions, most notable of which is a 25-