MENSTRUAL CYCLE: OVULATION
The menstrual cycle involves a series of hormonal events which occur at fairly regular intervals. The average menstrual cycle is approximately 28 days, although this may vary considerably between women. The menstrual cycle involves four distinct phases:
Day 1-5: menstruation (the menstrual period);
Day 3-13: the proliferative or follicular phase;
Day 15-28: the luteal or secretory phase.
Although the first day of menstruation is usually referred to as the start of the menstrual cycle, the menstrual period (days 1-5) is actually the culmination of the hormonal changes which make up the menstrual cycle.
Ovulation-On about day 14 the oestrogen levels in the bloodstream reach a peak which causes the pituitary gland to release a surge of luteinising hormone (LH). This surge of LH causes the mature ovarian follicle in the ovary to rupture and release its ovum. This process is known as ovulation.
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