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 month Abib (Ex. 13:4; 23:15) was the first month, and the start of the first of the 4 seasons. This was around the months March/April on Gregorian calendar, and was the time of the barley harvest. The current Jewish calendar is a lunar calendar, based on lunar months of 29 days alternating with 30 days. An every 3 years, add an extra month, based on a cycle of 19 years.