Periodintervall

Periodintervall, also known as a menstrual cycle, is the time between the start of one menstrual period and the start of the next. It is a natural process in the female reproductive system that typically occurs every 21 to 35 days, with an average duration of about 28 days. The menstrual cycle is regulated by hormones, primarily estrogen and progesterone, which are produced by the ovaries.

The menstrual cycle consists of several phases: the menstrual phase, the follicular phase, ovulation, and the luteal phase. The menstrual phase begins with the start of menstruation and lasts for about 3 to 7 days. The follicular phase follows, during which the follicle in the ovary grows and releases an egg. Ovulation occurs mid-cycle, when the egg is released from the ovary. The luteal phase begins after ovulation and ends with the start of the next menstrual period. If fertilization occurs, the corpus luteum produces progesterone to support the developing embryo.

The length of the menstrual cycle can vary from woman to woman and can change over time due to factors such as stress, hormonal imbalances, and certain medical conditions. Regular tracking of menstrual cycles can help individuals understand their body's natural rhythms and may be useful for fertility awareness and family planning.