Reproduction in lower and Higher Animals (Part 2) Menstrual Cycle : The menstrual cycle is a characteristic of primates. It starts at the time of puberty and the period is called menarche. The menstrual cycle in humans lasts for 28 days. The days are numbered from the first day of blood flow in the menstrual period. A series of events occur regularly in females after every 26 to 30 years. The menstrual cycle includes four phases:- I) Menstrual ovulation phase/Menstrual cycle phases : It is also called as bleeding phase this phase extends from the 1st to the 4th day of the menstrual cycle. When the ovum is not fertilized, the high-level progesterone inhibits the secretion of luteinizing hormone, and the LH level decreases in the level of progesterone from the corpus leuteum. After 14 days of ovulation, if the ovum is not fertilized, the lining of the uterus degenerates, and menstruation begins. This phase lasts about 4 days. The days when bleedi...
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