ScienceExplained: MenstruationTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience04/17/2020April 17, 2020Menstruation is an essential part of women's monthly hormone cycle. A woman loses around 70 mm of blood during each period. The whole cycle lasts around 28 days.https://p.dw.com/p/3LZXOAdvertisement