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From Wikipedia, the free encyclopedia. The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions occurring in many animals that produces urea ((NH2)2CO) from ammonia (NH3). This cycle was the first metabolic cycle discovered (Hans Krebs and Kurt Henseleit, 1932), five years before the discovery of the TCA cycle. In mammals, the urea cycle takes place primarily in the liver, and to a lesser extent in the kidney.
A menstrual cycle is the time period between your first day of your menstrual period, the time you bleed, until the next time of your menstrual period. The changes associated with ovulation and menstrual cycle are brought on by fluctuations in hormones at different times of the month. The luteal phase (days 14 through 28) is the time from when the egg is released (ovulation) until the first day of menstruation, when you get your period. 2  It is a structure that grows in the ovary where a mature egg was released at ovulation.