If there is an egg in an oviduct, and a sperm head enters fertilization will occur, Sperm from the penis are released into the vagina during sexual intercourse., The sperm swim through the cervix into the uterus and up the oviducts., The fertilized cell starts multiplying as it moves into the uterus and implants, Most sperm swim the wrong way..

Papan mata

Gaya visual

Pilihan

Tukar templat

Pulihkan autosimpan: ?