Fertilization is the epic story of a single sperm facing incredible odds To unite with an egg and form a new human life it is the story of all of us During sexual intercourse about 300 million sperm enter the vagina Soon afterward millions of them will either flow out of the vagina or die in its acidic environment However many survive because of the protective elements provided in the fluid surrounding them Next the sperm must pass through the cervix and opening into the uterus Usually it remains tightly closed but here the cervix is open for a few days while the woman ovulates The sperm swim through the Cervical Mucus which is thinned to a more watery consistency for easier passage Once inside the cervix the sperm continue swimming toward the uterus though millions will die trying to make it through the mucus Some sperm remain behind caught in the folds of the cervix, but they may later continue the journey as a backup to the first group Inside the uterus muscular uterine contractions assist the sperm on their journey Toward the egg However resident cells from the women’s immune system mistaking the sperm for foreign invaders, destroy thousands more Next half the sperm head for the empty Fallopian Tube while the other half swim toward the Tube containing the unfertilized egg now only a few thousand remain Inside the Fallopian Tube tiny cilia pushed the egg toward the Uterus To continue the sperm must surge against this motion to reach the egg Some sperm get trapped in the cilia and die during this part of the journey chemicals in the reproductive tract cause the membranes covering the heads of the sperm to change as a result, the sperm become hyperactive swimming harder and faster toward their destination at long last the spam reached the egg only a few dozen of the original 300 million sperm remain The egg is covered with a layer of cells called the Corona radiata The sperm must pushed through this layer to reach the outer layer of the egg the Zona Pellucida When sperm reached the Zona Pellucida they attach to specialized sperm receptors on the surface Which triggers their acrosomes to release digestive enzymes enabling the sperm to burrow into the layer Inside the Zona Pellucida is a narrow fluid filled space just outside the egg cell membrane The first sperm to make contact will fertilize the egg After a perilous journey and against incredible odds a single sperm attaches to the egg cell membrane Within a few minutes their outer membranes fuse and the egg pulls the sperm inside This event causes changes in the egg Membrane that prevent other sperm from attaching to it Next the egg releases chemicals that push other sperm away from the egg and create an impenetrable fertilization membrane As the reaction spreads outward the Zona Pellucida hardens trapping any sperm unlucky enough to be caught inside Outside the egg, sperm are no longer able to attach to the Zona, Pellucida Meanwhile inside the egg the tightly packed male genetic material spreads out a new Membrane forms around the genetic material creating the male pronucleus Inside the genetic material reforms into 23 chromosomes the female genetic material awakened by the fusion of the sperm with the egg finishes dividing resulting in the female pronucleus which also contains 23 chromosomes as the male and female pronuclei form spider web-like threads called Microtubules pull them toward each other the two sets of Chromosomes joined together Completing the process of fertilization at this moment a unique genetic code arises instantly determining gender, hair color, eye color and hundreds of other characteristics this new single cell the zygote is the beginning of a new human being and now the cilia and the Fallopian Tube gently sweep the Zygote toward the uterus Where he or she will implant in the richer uterine lining Growing and maturing for the next nine months until ready for birth

100 thoughts on “Fertilization”

  1. 4:56 At this moment a unique genetic code arises INSTANTLY determining gender, hair color and hundreds of other characteristics. This is a scientific lesson for Pro-choice idiots that categorically and undeniable states that life begins at CONCEPTION!!!!

  2. so that lazy ass bitch's egg just lays there while us guys send 300 million minus one to their deaths just to get her egg off? fuck that.

  3. I don't want worms to die in my body and I don't want worms to explore my body like Dora and make a other worms like ew I was made by worms!!

  4. And I don't want a camra man in my body is he/she tiny are something like my mom had WORMS AND A CAMRA MAN THATS HOW BABIES ARE MADE HOW DOES THE WORMS GET IN THE BODY!!!!???

  5. Everytime its always the combination of both!! It starts with a man and a woman, Next sperm and an egg, next male and woman genentic materials ( chromosomes) Its always the two!! I love this relationship of man and a woman!! Which has the capability of creating a new generation naturally!! The relation, Its sacred!! Its Powerful !! Its revolutionary!! ❤️

  6. Y’all just looking at the sperm side. There’s more to the race. Once the egg is fertilized it’s up to mom’s body not to cast you out. A egg can not implant or pregnancy can be ectopic. As for the rest you know the rest…. sad story really. Thank God y’all made it…. a moment of silence for the ones that didn’t.

  7. I can’t believe people see this and still don’t believe in God and think there was a boom and then wam bam here we are like I— I— I don’t get it.

  8. o_o This is a great video for education, however it is a bit scary. As we heard, 1 out of 300 Million sperm! You are SO lucky that YOU are the one to live, this is exactly why you should love your mother and father, because they brought you to this world! You should love your family too.
    Besides, there are unlucky habits that you might, like they said, die in acidic environment. Although it is a very, very small chance. So don't worry! You will be one of them who may survive.

    As he said, millions would die swimming through the mucus, which is another scary thing. If your lucky enough you would either get stuck in the folds of the cervix as you survive or you would go through the entire journey without being stuck. That's another thing.

    The white things in a vagina mistake sperm making them think they're actually eggs, but when a sperm cell gets inside one of those, they get destoryed. Thousands get destroyed. Ooh, that would be horrendous. Some sperm get trapped into the cilia and die, another scary horrendous event.

    If your so lucky, you'll be one of those who would reach the egg. BUT This is the scariest and final part. One out of all the sperm reaches the egg. The scariest part EVER, is that you may get inside the egg. But one has got inside first, so you have a possibility for you to be dead or a slight chance that'll make twins.

    After all the events, your finally inside the egg for approximately 9 consecutive months inside your mother's womb. And you'll be in this world. It is a miracle that we are living. Just keep in mind, you are LUCKY that your living. Even if your life is tough, just be happy that you are living.

    Now lets say, if you had sex, then thats a different story. Because you and your (husband/wife) or (boyfriend/girlfriend) will be EXPECTED an pregnancy. And the same events happen to that sperm and that child is ready to be welcomed to the world.

  9. so i'm a twin. Are you saying that my twin and I touched the egg at the same time? Shit, I wish I got to it faster.

    My bad, just searched it up and says that we used 2 different eggs.

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