Reproduction and basic genetics

Menstruation refers to the process of physiological changes in women and other female primates in which an egg is produced in a process known as ovulation. The uterine lining thickens to allow for the implantation if fertilization of the egg occurs. If the egg is not fertilized, the uterine lining breaks down and is discharged during menstruation. This activity occurs on monthly basis. (Menstrual Cycle, the Free Dictionary) The repetitive monthly production of hormones which results in the release of a mature egg, also referred to as ovum, is called the menstruation cycle. This process begins at puberty and ends during menopause. The first menstrual cycle is known as the menarche. Just above the brain lies the hypothalamus pituitary gland, which together with the ovaries, produce the hormones that control the menstrual cycle. An egg matures in the ovary in preparation for the womb to establish pregnancy. When pregnancy is not achieved, menstruation occurs.

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