Using animated graphics, this program clearly and vividly illustrates the biological functions of the different parts of the male and female reproductive systems. It shows how millions of sperm race through the uterus and into the fallopian tube where fertilization occurs, and subsequently how the fertilized egg develops into an embryo. Program also describes the basics of menstruation. Animated graphics vividly detail the different stages or trimesters of embryonic and fetal development.
A handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’re one of the select few mammals on Earth that menstruate, and we also do it more than any other animal, even though it’s a waste of nutrients, and can be a physical inconvenience. So where’s the sense in this uncommon biological process? TED-Ed describes the history and evolution of menstruation.