Most girls only lose less than 150 ml per month during the physiological period. The average female menstrual cycle is 12 -5 1 year, and the cycle is 2 1-35 days. Some apes also have a physiological cycle similar to that of humans. The physiological cycle of female orangutans is about 29 days.
Extended data
Main components of menstruation: The main components of menstruation are blood (3/4 arterial blood,14 venous blood), endometrial tissue fragments and various active enzymes and biological factors. Among them, fibrinolytic enzyme makes menstrual blood become liquid without coagulation, and prostaglandin plays a role in contracting uterus. ?
Medically, the reproductive cycle experienced by only primates (including humans) is called menstruation, and the reproductive cycle of other mammals is called estrus cycle. Menstruation is regulated by reproductive hormone system and is the need of biological reproduction.
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