The human reproductive system is all about how the timing, hormones, male and female reproductive systems. First, in order for a baby to come into this world, the male and the female reproductive systems must work correctly. Both male and female has their own/different parts that work in order for a baby to be conceived. Although the male and the female reproductive systems are different, once they meet and come together they work together to make a baby at the end of result.
For fertilization to take place, sperm must be present either a couple of days prior to or on the day of ovulation. Sperm must first cross the barrier of the cervix, which will be thin and watery if the woman has just ovulated. Once the sperm have traversed the cervical mucus, they travel up the moist lining of the uterus into the Fallopian tubes. Since only one of the Fallopian tubes contains an egg, many sperm travel in the wrong direction. Fewer than 1,000 sperm out of the millions in the semen reach the Fallopian tubes, and only a few dozen actually reach the membrane of the egg.
The lucky few sperm who reached the egg in the Fallopian tube surround it and begin competing for entrance. The head of each sperm, the acrosome, releases enzymes that begin to break down the outer, jelly-like layer of the egg's membrane, trying to penetrate the egg. Once a single sperm has penetrated, the cell membrane of the egg changes its electrical characteristics. This electrical signal causes small sacs just beneath the membrane to dump their contents into the space surrounding the egg. The contents swell, pushing the other sperm far away from the egg in a process called cortical reaction. The cortical reaction ensures that only one sperm fertilizes the egg. The other sperm die within 48 hours.
The fertilized egg is now called a zygote. The depolarization caused by sperm penetration results in one last round of division in the egg's nucleus, forming a pronucleus containing only one set of genetic...