How to Get Fertilization | Delivery | Fertile Period | Fetal circulation

СЕНІҢ ДЕНЕҢ: FERTILIZATION Fertilization occurs when the head of a sperm penetrates a mature ovum. After penetration, the nuclei (which contain the genetic material) of the sperm and ovum fuse and the body and tail of the sperm drop off. The newly fertilized ovum cal led a zygote then forms an outer layer that is impenetrable to other sperm. The zygote undergoes repeated cell divisions as it passes down the Fallopian tube. By the time it reaches the uterus, it has grown into a solid Ары қарай оқу [...]