pituusjakson

Pituusjakson, also known as the menstrual cycle, is a biological process that occurs in the female reproductive system. It is characterized by a series of hormonal changes that prepare the body for potential pregnancy. The average menstrual cycle lasts about 28 days, but it can vary from 21 to 35 days. The cycle is divided into several phases: the menstrual phase, the follicular phase, ovulation, and the luteal phase.

The menstrual phase begins with the shedding of the uterine lining, which occurs if pregnancy does not occur. This phase typically lasts about 3 to 7 days. Following this, the follicular phase begins, during which the follicles in the ovaries mature and one dominant follicle is selected to release an egg. This phase lasts about 10 to 14 days.

Ovulation occurs approximately mid-cycle, when the dominant follicle releases an egg into the fallopian tube. This phase is relatively short, lasting only about 12 to 24 hours. After ovulation, the luteal phase begins, during which the remaining follicle transforms into the corpus luteum, which produces progesterone to prepare the uterine lining for potential implantation of a fertilized egg. This phase lasts about 14 days.

The menstrual cycle is regulated by a complex interplay of hormones, including follicle-stimulating hormone (FSH), luteinizing hormone (LH), estrogen, and progesterone. Disruptions in this hormonal balance can lead to irregular menstrual cycles, which can be a sign of various health conditions.

Understanding the menstrual cycle is important for various aspects of reproductive health, including fertility awareness, contraception, and the diagnosis and treatment of menstrual disorders. Regular tracking of menstrual cycles can help individuals and healthcare providers monitor reproductive health and identify potential issues early.