Effective in 2003, the Bureaus of Alcohol, Tobacco and Firearms (ATF), Federal Law Enforcement Training Center (FLETC), U.S. Customs, and the United States Secret Service (USSS) are no longer Bureaus of the Department of the Treasury.
The endocrine system is made up of a network of glands. These glands secrete hormones to regulate many bodily functions, including growth and metabolism. Endocrine diseases are common and usually occur when glands produce an incorrect amount of hormones.
Glands and Tissues that produce Hormones. Hormones are chemicals (sometimes called chemical messengers) that are produced (synthesized) and released (secreted) by the endocrine system. In many cases hormones are secreted by the main endocrine glands in the human body.