My name is Summer, a girl sperm who is racing all these other sperms. I have just entered the vagina and am being protected by my trustworthy friend Celine.
That's right, I protect her from the acids, other rude sperm, and more that will come later.
Surviving through the Cervix
Try going to the bottom, it doesn't seem like its that bad down there.
Now I have to dodge these deadly acids in the cervix
That's a great idea!
Traveling through the Uterus
Swim very fast and don't look back! If they see you again, they'll come after you again.
Oh no! It's the white blood cells, if I get caught i'll never get to the egg!
Millions of sperm are now in the womans vagina getting ready to face the obstacles through the cervix. Only 99% of these sperm will survive before going into the cervix due to the deadly acids that help prevent pathogens in the vagina.
Getting to the Uterotubal Junction and Fallopian tubes
In order to make it to the cervix, 60,000 sperm have to race to get there. They have to get past the deadly acids in the path that fight off pathogens. The sperm have to go get into the cervix one at a time and many will die due to a loss of direction and dead end passageways.
The Process of Fertilization
Now, 3,000 of the sperm have to make it to the fallopian tubes through the uterus. Muscles in the uterus will help give directions to the sperm by leading them to the fallopian tube with the egg. The sperm has to watch out for white blood cells, also known as leukocytes. The sperm that survived that fight have to find the passageway to the fallopian tube.
Being able to Implant
Uterotubal Junction: Once the remaining sperm have found the door to the fallopian tube, only the ones with good swimming skills and molecular structure will be able to pass through. Fallopian Tube: The race continues between 10-30 sperm that gain nutrition from the fallopian tube so they can stay alive for the egg that will be released.
I made to the door of the Fallopian tube!
Yes, and make sure you swim fast!
Do I keep Swiming?
The sperm has to sense the chemicals released by the egg so they can find it in 24 hours near the fallopian tube. Once the first sperm has reached the egg, it coats the egg with enzymes and gets inside the egg. The sperm then releases 23 chromosomes to match with the eggs 23 chromosomes. The sperm is either an X (girl) or a Y (boy) which determines the babies the gender. The egg is always an X.
My pleasure! I'm so happy you made it here.
I'm almost there! Thank you so much for helping through this journey!
The combined sperm and egg, known as a zygote, travels to the uterus and there cells start dividing. Blastocryt is what the group of cells is called on the fourth day. On the ninth day, the embryo stays in the uterus and starts to grow.