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.
The Jewish holiday of Rosh Hashanah begins at sundown. Sundown today marks the start of the Jewish holiday of Rosh Hashanah. The two-day holiday is known popularly as Jewish New Year. The Hebrew calendar date for the year is 5775. Yesterday he Huffington Post described the holiday in an all-you-need know post: