cycle /cy·cle/ (si´k'l) a succession or recurring series of events.
Menstrual cycle
menstrual cycle,
menstrual cycle,
Patient discussion about Female cycle.
carbon cycle the steps by which carbon (in the form of carbon dioxide) is extracted from the atmosphere by living organisms and ultimately returned to the atmosphere. It comprises a series of interconversions of carbon compounds beginning with the production of carbohydrates by plants during photosynthesis, proceeding through animal consumption, and ending and beginning again in the decomposition of the animal or plant or in the exhalation of carbon dioxide by animals.
cardiac cycle a complete cardiac movement, or heart beat, including systole, diastole, and intervening pause. 
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Events of the cardiac cycle.
cell cycle the cycle of biochemical and morphological events occurring in a reproducing cell population; it consists of: the S phase, occurring toward the end of interphase, in which DNA is synthesized; the G2 phase, a relatively quiescent period; the M phase, consisting of the four phases of mitosis; and the G1 phase of interphase, which lasts until the S phase of the next cycle.
citric acid cycle tricarboxylic acid c.
Cori cycle the mechanism by which lactate produced by muscles is carried to the liver, converted back to glucose via gluconeogenesis, and returned to the muscles.
γ-glutamyl cycle a metabolic cycle for transporting amino acids into cells.
Krebs cycle tricarboxylic acid c.
Krebs-Henseleit cycle urea c.
menstrual cycle the period of the regularly recurring physiologic changes in the endometrium, occurring during the reproductive period of female humans, culminating in partial shedding of the endometrium and some bleeding per vagina (menstruating). 
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Changes in the menstrual cycle in the human female. Solid lines indicate the course of events when the oocyte is not fertilized; dotted lines indicate the course of events when fertilization occurs. Arrows indicate the actions of hormones of the pituitary and the ovary in regulating the cycle.
mosquito cycle that period in the life of a malarial parasite that is spent in the body of the mosquito host.
nitrogen cycle the steps by which nitrogen is extracted from the nitrates of soil and water, incorporated as amino acids and proteins in living organisms, and ultimately reconverted to nitrates: (1) conversion of nitrogen to nitrates by bacteria; (2) the extraction of the nitrates by plants and the building of amino acids and proteins by adding an amino group to the carbon compounds produced in photosynthesis; (3) the ingestion of plants by animals, and (4) the return of nitrogen to the soil in animal excretions or on the death and decomposition of plants and animals.
ornithine cycle urea c.
ovarian cycle the sequence of physiologic changes in the ovary involved in ovulation.
reproductive cycle the cycle of physiologic changes in the female reproductive organs, from the time of fertilization of the oocyte through gestation and parturition.
sex cycle , sexual cycle
1. the physiologic changes recurring regularly in the genital organs of nonpregnant female mammals; in humans, the menstrual cycle.
2. the period of sexual reproduction in an organism that also reproduces asexually.
tricarboxylic acid cycle the final common pathway for the oxidation to CO2 of fuel molecules, most of which enter as acetyl coenzyme A; it also provides intermediates for biosynthetic reactions and generates ATP by providing electrons to the electron transport chain. 
)
Tricarboxylic acid cycle. Diagrammatic representation of reactions by which carbon chains of sugars, fatty acids, and amino acids are metabolized to yield carbon dioxide. Water produced by the cycle and components of the high-energy phosphate pool generated by the associated electron chain are not shown.
urea cycle a series of metabolic reactions in the liver, by which ammonia is converted to urea using cyclically regenerated ornithine as a carrier. 
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Urea cycle. Diagrammatic representation of reactions by which excess nitrogen in the form of ammonia is converted to soluble urea, using l-ornithine as a recyclable carrier.
uterine cycle the phenomena occurring in the endometrium during the menstrual cycle, preparing it for implantation of the blastocyst.
visual cycle the cyclic interconversion of 11-cis- retinal and all-trans- retinal and association with opsins, creating an electric potential and initiating the cascade generating a sensory nerve impulse in vision. 
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Visual cycle of retinal rod cells; an analogous cycle occurs with iodopsins in the cones.
| menstrual cycle n. The recurring cycle of physiological changes in the uterus, ovaries, and other sexual structures that occur from the beginning of one menstrual period through the beginning of the next. |
Menstrual cycle
A hormonally regulated series of monthly events that occur during the reproductive years of the human female to ensure that the proper internal environment exists for fertilization, implantation, and development of a baby. Each month, a mature egg is released from the follicle of an ovary. If an egg is released, fertilized, and implanted, the lining of the uterus continues to build. If fertilization and/or implantation does not occur, the egg and all of the excess uterine lining are shed from the body during menstruation.
Mentioned in: Human Chorionic Gonadotropin Pregnancy Test
menstrual cycle,
the recurring cycle of change in the endometrium during which the decidual layer of the endometrium is shed, then regrows, proliferates, is maintained for several days, and is shed again at menstruation. The average length of the cycle, from the first day of bleeding of one cycle to the first of another, is 28 days. The duration and character vary greatly among women. Menstrual cycles begin at menarche and end with menopause. The uterine phases of the cycle are the menstrual phase, proliferative phase, and secretory phase. See also oogenesis.
menstrual cycle,
n a recurring cycle of change in the endometrium during which the decidual layer of the endometrium is shed, then regrows, proliferates, is maintained for several days, and is shed again at menstruation. The average length of the cycle is 28 days.
Patient discussion about Female cycle.
Q. can you get poly-cystic ovarian syndrome when you still have your menstrual cycle?
A. polycystic ovarian syndrome is when the egg does not come out- so i guess there is no menstrual that month. but as far as i know it's not every month that an egg decides to stay at home after 18... i guess you can check up more exact at this site:
http://www.pcosupport.org/
http://www.pcosupport.org/
Q. is it normal to get a nausous feeling around the time i would start my menstrual cycle?
A. Yes, it is absolutely normal to feel nausea before and during menstrual cycle. The shift in hormonal levels can cause also headaches, mood changes, feeling of bloating and other common symptoms.
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