Sperms enter through the vaginal passage during sexual intercourse and travel upwards to reach the oviduct. In the oviduct, they may encounter the egg, leading to fertilization. The fertilized egg, or zygote, then starts dividing and forms a ball of cells or embryo.
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Sperms reach the oviduct (fallopian tube) through the vagina and cervix, aided by uterine contractions and cervical mucus. During sexual intercourse, sperm travel through the cervix and enter the uterus, eventually reaching the fallopian tube where fertilization occurs. When a sperm encounters the egg, it undergoes the acrosome reaction, releasing enzymes to penetrate the egg’s protective layers. Upon successful penetration, the sperm’s genetic material fuses with the egg, forming a zygote. This process, known as fertilization, marks the beginning of embryonic development. The zygote undergoes cell division, forming a blastocyst that eventually implants into the uterus for further development.