Hey, i´m kalus and i am going to take you on a journey to the sperm. We will encounter 6 stop along the way. The first stop is the Vagina. Through the vagina about 250 sperm enter all at once, and only 99% of sperm die within the first 30 minutes.
The sperm are destroyed by deadly acids that helps protect the vagina. These sperm below are gonna have a crazy ride.
Now that we made it through the vagina, we will now enter the tightly shut door which is the cervix with mucus to protect. Only 60,000 sperm made it this far. The sperm will swim in a single file line up through the cervical canal to the next destination.
At this point 3,000 sperm are left. With the help of the muscular contraction from the uterus the sperm travel to the uterotubal. During this the sperm flights off white blood cells
The doorway to the Fallopian tube. Where the sperm have to swim in narrow way.
~ Approximately 250 million sperm enter the vagina, most of them die (99 percent) within 30 minutes ~ Defenses: Sperm destroyed by deadly acids the protect vagina from pathogens.
In the Fallopian tube only 10-30 sperms remain. The eggs release chemical so the sperm sense to move quickly. Once the sperm gets inside genes are delivered
~ 60,000 remaining sperm must navigate through the cervix located at the far end of the vagina ~ Cervix usually plugged shut with mucus to defend against invading pathogens. However, during ovulation, estrogen flow from the ovary to the uterus, which soften the mucus to make it watery so sperm can navigate through. ~
Fallopian Tube/ Fertillization
Four day later tiny bundle of cells are created. Within five day later the protective shell implants itself into the uterus and begins growing into what will be called the baby. That will be delivered in 9 months.
~ Approximately 3000 sperm remain and must navigate through the uterus to the Fallopian tube. ~ Muscular contractions of the will help to propel sperm in the direction of the correct Fallopian tube on the side of the egg ~ Remaining sperm must search the doorway to the Fallopian tube
Implantation in the Uterus
~Sperm must show the proper swimming characteristics and display the correct molecular recognition to be allowed to pass through
~ Approximately 10-30 sperm remain.Once inside, sperm are safe from attack by leukocytes. ~ Sperm are provided with nourishment from the Fallopian tube so they stay alive for several hours even days. ~ Egg releases chemicals the the sperm can sense and they begin to move more quickly
The union of sperm and egg travel down the Fallopian tube towards the uterus, cells begin dividing. On day four tiny bundles of cells is named a blastocyst. ~ 5 days later, the embryos breaks out of protective shell and implants in the wall of the uterus and begins growing