maandensysteem

A maandensysteem, or menstrual cycle system, refers to the biological and physiological processes that regulate reproductive functions in many female mammals, including humans. It encompasses a series of regularly recurring changes in the ovaries and the lining of the uterus (endometrium), primarily driven by hormonal fluctuations.

The typical cycle lasts about 28 days, although this can vary among individuals. It begins with the menstrual phase, during which the uterine lining is shed if pregnancy does not occur. This is followed by the follicular phase, where follicles in the ovaries mature under the influence of follicle-stimulating hormone (FSH). Rising estrogen levels during this phase promote the thickening of the uterine lining.

Ovulation marks the midpoint of the cycle, triggered by a surge in luteinizing hormone (LH), leading to the release of an egg from a mature follicle. After ovulation, the luteal phase ensues, characterized by the formation of the corpus luteum, which secretes progesterone to sustain the uterine lining. If fertilization does not occur, progesterone levels decline, leading to the breakdown of the endometrium and the start of a new cycle.

The maandensysteem plays a crucial role in reproductive health and fertility. It is influenced by internal hormonal regulation and external factors such as stress, health status, and lifestyle. Understanding the cycle is vital for contraceptive planning, diagnosing reproductive disorders, and managing hormonal health.

Overall, the maandensysteem is a complex, tightly regulated biological system that ensures reproductive readiness and hormonal balance in females of species that have defined reproductive cycles.