Endocrine System Introduction. The endocrine system is made up of glands that produce and secrete hormones, chemical substances produced in the body that regulate the activity of cells or organs.he major glands of the endocrine system are the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pineal body, and the reproductive organs (ovaries and testes).
The Heptarchy, according to Bartholomew's A literary & historical atlas of Europe (1914) The Heptarchy is a collective name applied to the seven petty kingdoms of Anglo-Saxon England from the Anglo-Saxon settlement of Britain in 5th century until their unification into the Kingdom of England in the early 10th century. The term Heptarchy alludes to the tradition that there were seven Anglo-Saxon kingdoms, usually enumerated as: East Anglia, Essex, Kent, Mercia, Northumbria, Sussex and Wessex. The Anglo-Saxon kingdoms eventually unified into the Kingdom of England. The historiograph
The Eastern Augustus was the most senior ruler in the Tetrarchy. Every twenty years, the Caesars would replace the Augusti who would retire. Merit and ability determined the appointment of new Caesars. In this article I shall explain the creation and the successes of the Tetrarchy. 1. Why was the Tetrarchy necessary? In the 3rd century, the Roman Empire stretched from one end of the Mediterranean to the other. The defence and administration of such a vast empire was difficult.