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.
Held on the tenth day of the Jewish month of Tishri, Yom Kippur, is seen to be the holiest day of the year for Jews. By Hannah Crouch. 10th October 2016, 10:52 am. Updated: 10th October 2016, 7:28 pm. Click to share on Twitter (Opens in new window) Click to share on Facebook (Opens in new window)