Adrenal GlandsIdentification and Description of the Organs that Make Up the Endocrine SystemThe human body is composed of organ systems that are distinct but work together as a single coordinated unit (Marieb & Hoehn 1-35). This article will single out the endocrine system because discussing the organ system in its entirety is beyond the scope of this assignment. Adrenal glands are an integral part of the endocrine system, hence the relevance of the topic. Endocrine glands include glands that secrete hormones that help modulate cell and/or organ functions. Hormones are chemical substances that regulate cellular activities (Axelrod et al 452-459). They act as messengers as they transmit information from one part of the body to another. The main glands of the endocrine system are the hypothalamus, the thyroid and parathyroids, the pineal body, the reproductive organs; pituitary and, most importantly in this article, the adrenal glands (Axelrod et al 452-459). To understand how the adrenal glands work it is necessary to explore the other organs of the endocrine system mentioned above. Let's start with the pituitary gland. The process is compensated by a signal sent from the hypothalamus to the pituitary gland in the form of “releasing hormone”, which in turn requires the production of stimulating hormone in the circulatory system (Melmed et al 34), once it reaches the gland or l the target organ, stimulates it to produce the required hormone. An increase in the level of the target hormone in circulation leads to a decrease in the production of releasing and stimulating hormones to the slow release of hormones from the target organ, leading to the stabilization of the balance of hormones circulating in the blood. tyreo...... half of the article......nostic tool for Cushing's syndrome and adrenal insufficiency: improved screening using an automated immunoassay." European Journal of Endocrinology 166.4 (2012): 613- 618.Iyengar, G. Venkatesh. Elementary analysis of biological systems: biological, medical, environmental, compositional and methodological aspects Vol. 1. Pearson Education, 2007. Melmed,. Shlomo, et al. Williams Endocrinology Textbook: Expert Advice. Elsevier Health Sciences, 2011.Steffensen, Charlotte, et al. "Epidemiology of Cushing's Syndrome 92.Suppl; Landsberg, L. Catecholamines and the adrenal medulla. In: Wilson, J.D.; Foster, D.W.; Kronenberg, H.M.; Larsen, P. R. eds. Williams Textbook of Endocrinology. Philadelphia: WB Saunders; 1998:665-728