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.
Black History Month: Paying Tribute to the Contributions of African Americans. Since it was created 1976, Black History Month has been a time to reflect on the contributions of African Americans to our country. Throughout our history, African American men and women have perseveredâdespite hardship and prejudiceâto enrich our nation in innumerable ways.