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Ovulation describes the process by which a mature ovum is expelled from a mature ovarian follicle into the fallopian tubes. The ovum then travels through the fallopian tube to the uterus, where it can be fertilized by sperm for about 24 hours. If the ovum is fertilized, it nests in the lining of the uterus. If it is not fertilized, it is expelled with the next menstruation.
Thus, ovulation is a key part of the menstrual cycle and makes pregnancy possible. There are a variety of signs that indicate ovulation. These are, for example:
the increase of the LH hormone
changes in cervical mucus
increase in basal body temperature