Contraceptives can prevent pregnancy in three basic ways: they either block sperm, disable sperm before they reach the uterus, or suppress ovulation. But is one better than the other? How does each one work?
This video gives a description of women's monthly menstrual cycles or periods. The video includes information about the biological and hormonal changes during the cycle.
What are the evolutionary explanations for the human menstrual cycle? This video adds a unique understanding to human menstruation, pregnancy and women's health.
