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.
Yom Kippur is the last of the Jewish high holidays. It is usually observed on the 10th day of the 7th month in the Jewish culture. This year Yom Kippur is on September 22nd. This is one of the most important days in a Jewish person's life and most Jews who do not celebrate other Sabbath days will celebrate this one because of how important it is.