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: The celebration of Black History Month began as âNegro History Week,â which was created in 1926 by Carter G. Woodson, a noted African American historian, scholar, educator, and publisher. It became a month-long celebration in 1976. The month of February was chosen to coincide with the birthdays of Frederick Douglass and Abraham Lincoln.