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.
Best Answer: Black History Month is celebrated annually in the United States in the month of February. Carter G. Woodson chose the second week of February for ***** History Week in 1926 because it marks the birthdays of two men who greatly influenced the black American population, Frederick Douglass and Abraham Lincoln. Later on in 1976, as the nation reached its bicentennial, the week was expanded into an entire month.