menstrualsyklusen

Menstruationszyklusen refer to the regular changes that occur in a female body as a result of the menstrual cycle. This cycle is controlled by hormones and typically lasts between 21 and 35 days. During this time, the body prepares for a potential pregnancy by thickening the lining of the uterus, which is shed if pregnancy does not occur.

The menstrual cycle is divided into three phases: the menstrual phase, the follicular phase, and the luteal phase. The menstrual phase begins on the first day of menstruation and lasts for several days. During this time, the uterus sheds its lining, and blood is discharged from the body. The follicular phase starts after menstruation and lasts until ovulation, during which time the pituitary gland releases follicle-stimulating hormone, which causes the growth and maturation of follicles in the ovaries. Ovulation occurs when a mature follicle releases an egg from the ovary.

The luteal phase follows ovulation and lasts until the start of menstruation the following month. During this time, the empty follicle in the ovary produces progesterone, which helps prepare the uterus for a fertilized egg. If pregnancy does not occur, the progesterone level drops, and menstruation begins.

Menstruationszyklusen can be affected by a variety of factors, including hormonal changes, stress, and certain medical conditions. Regular menstrual cycles are considered normal if they last between 21 and 35 days and bleeding occurs within seven days of the predicted start date.