THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Fertilization usually takes place in a fallopian tube that links an ovary to the uterus. If the fertilized egg successfully travels down the fallopian tube and implants in the uterus, an embryo starts growing.

Detailed explanation-2: -During fertilization, the sperm and egg unite in one of the fallopian tubes to form a zygote. Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst. The blastocyst then burrows into the uterine lining-a process called implantation.

Detailed explanation-3: -Contact Between Sperm and Oocyte. Upon ovulation, the oocyte released by the ovary is swept into-and along-the uterine tube. Fertilization must occur in the distal uterine tube because an unfertilized oocyte cannot survive the 72-hour journey to the uterus.

Detailed explanation-4: -The life of mammals begins at fertilization when sperm and egg meet in the oviductal ampulla of the female reproductive tract. Gametic fusion begins with membrane binding and can be visualized by sperm internalization that happens within minutes to hours of gamete mixing.