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.
â J.H. Clarke. February is observed as âBlack History Monthâ in America. Its precursor, âNegro History Week,â was created by Dr. Carter G. Woodson in 1926 and observed on the second week of February. A staunch Republican, Woodson chose that week in that month to honor the birthdays of Frederick Douglass and Abraham Lincoln. Woodson created Negro History Week because Black Americans and their accomplishments were largely left out of the educational curricula of that time.