ovulation
ov·u·late
O5219500 (ŏv′yə-lāt′, ō′vyə-)o·vu·la·tion
(ō′vyə-lā′shən, ŏv′yə-lā′shən)ovulation
Noun | 1. | ovulation - the expulsion of an ovum from the ovary (usually midway in the menstrual cycle) |
单词 | ovulation | |||
释义 | ovulationov·u·lateO5219500 (ŏv′yə-lāt′, ō′vyə-)o·vu·la·tion(ō′vyə-lā′shən, ŏv′yə-lā′shən)ovulation
Ovulationovulation[‚äv·yə′lā·shən]Ovulationthe discharge of the ovum from the ovary into the body cavity. The follicle that contains the ovum ruptures during ovulation; in humans and mammals it is called the Graafian follicle. Ovulation occurs periodically in females of most vertebrates and in women. In some animals, for example, the rabbit, cat, and polecat, it is triggered by copulation. It is stimulated by gonadotrophic hormones, which are secreted by the pituitary gland and are controlled by the central nervous system. In birds the number of daylight hours is a signal for ovulation; in fish, water temperature. Ovulationovulation[ov″u-la´shun]Ovulation takes place approximately at the midpoint of the menstrual cycle, 14 days after the onset of menstruation. During the preceding weeks, a graafian follicle (cell cluster in the ovary containing the oocyte) grows from the size of a pinhead to that of a pea. At the moment of ovulation, the follicle bursts open and the ovum is discharged. The discharged ovum enters the fallopian tube adjoining the ovary and moves toward the uterus; if it encounters a spermatozoon while it is still alive (about 48 hours), the two merge and fertilization takes place, usually in the fallopian tube. The fertilized ovum then makes its way to the uterus, where it becomes embedded in the prepared wall as the first stage of growth of the fetus (see illustration, and see also reproduction). If fertilization does not take place the ovum loses its vitality and the blood and tissue lining the uterus are shed in the menstrual flow. ![]() ov·u·la·tion(ov'yū-lā'shŭn, ō'vū-),o·vu·la·tion(ov'yū-lā'shŭn)ovulationThe release of an OVUM from a mature Graafian follicle in the OVARY. Ovulation occurs about half way between the beginning of consecutive menstrual periods, usually about 14 days before the expected date of onset of the next period.ovulationthe bursting of the OVARIAN FOLLICLE (See also GRAAFIAN FOLLICLE on the surface of the ovary with the release of an egg which then normally passes into the OVIDUCT.OvulationPatient discussion about OvulationQ. i just have my period last november 25 and ended on 28.when is my possible fertile and ovulation period please help me identify my fertile and ovulation period ovulation
Antonyms for ovulation
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