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Menstrual cycle The menstrual cycle is a series of natural changes in hormone production and the structures of the uterus and ovaries of the female reproductive system that makes pregnancy possible. The ovarian cycle controls the production and release of eggs and the cyclic release of estrogen and progesterone. The uterine cycle governs the preparation and maintenance of the lining of the ...
Menstruation. Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle. Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall ...
Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, [ 16 ] appearing every 72–80 years. [ 17 ] It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. Officially designated 1P/Halley, it is also commonly called Comet Halley, or sometimes simply ...
Newgrange ( Irish: Sí an Bhrú[ 1 ]) is a prehistoric monument in County Meath in Ireland, located on a rise overlooking the River Boyne, eight kilometres (five miles) west of the town of Drogheda. [ 2 ] It is an exceptionally grand passage tomb built during the Neolithic Period, around 3200 BC, making it older than Stonehenge and the Egyptian ...
Apnea can also be observed during periods of heightened emotion, such as during crying or accompanied by the Valsalva maneuver when a person laughs. Apnea is a common feature of sobbing while crying, characterised by slow but deep and erratic breathing followed by brief periods of breath holding when crying.
The history of ancient Egypt spans the period from the early prehistoric settlements of the northern Nile valley to the Roman conquest of Egypt in 30 BC. The pharaonic period, the period in which Egypt was ruled by a pharaoh, is dated from the 32nd century BC, when Upper and Lower Egypt were unified, until the country fell under Macedonian rule in 332 BC.
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