I'm lost, I gotta follow my nose to find my best friend and find our way back home.
I have to watch my step because this puddles of water are deep. Worst of all I can't swim.
Cervix
There's my way out.
Hahaha! Don't worry my friend, you came just in the right time to have break fast right boys!
Uterus
Oh no! It seemed like paradise at first but this place is infested with cats! Our worst enemies, I gotta run away!
Yeah!
Oh no! It seemed like paradise at first but this place is infested with cats!
I gotta run!
Approximately 250 million sperm enter the vagina, most sperm die (99%) within 30 minutes. In the picture above illustrates a dog going through a tunnel (the vagina) with dangerous puddles of water that can lead to death because of its unforeseen depths.
Fallopian Tube
I must chose a doorway quick! Nose you're my guide, through the tunnel!
Come over here you fool! I told you we should of ate him already.
60, 000 remaining sperm must navigate through the cervix at the end of the vagina . The cervix is usually plugged shut with mucus to defend against invading pathogens. However, during ovulation, estrogen flows from the ovary to the uterus which softens the mucus to make it watery so sperm can navigate through. In this picture the dog is looking at the cervix and seeing that there isn't more danger so he finds his way out of the vagina.
Fertilization [Fallopian tube]
Oh Ruby my darling I found you! Lets go back home.
Approximately 3, 000 sperm remain and must navigate through the uterus to the Fallopian tube. Muscular contractions of the uterus will help to propel sperm in the direction of the correct Fallopian tube. In this picture the dog enters the uterus but pass by a group of cats (the leukocytes) an fled because the cats wanted to harm him.
Implantation [Uterus]
Approximately 10-30 sperm remain. Once inside, sperm are safe from attacks by leukocytes. Sperm are provided with nourishment from the Fallopian tube. So they may stay alive for several hours, even days. This picture illustrates the dog about to enter the right Fallopian tube, thanks to his nose since he can smell which doorway was the good one.
I knew you would come to me sooner or later! Lets go.
The remaining sperm must attempt to find the egg at the upper end of the Fallopian tube. Egg releases chemicals that sperm can sense and they begin to move more quickly. Once sperm is inside, genetic payload is delivered and the 23 individual chromosomes of sperm and egg pair up and form into another cell called zygote. In this picture the dog found its "best friend" (found the egg) and quickly left to find their home.
I know the way follow me!
Ahh...home at last!
The zygote travels down the Fallopian tube towards the uterus, cells begin dividing. 5 days later, the embryo breaks out of the protective shell and implants in the wall of the uterus and begins growing. In the last picture above shows the two dogs that found their home (found uterus) and picked up their lives where they left on. They continued growing as well.
Merry Christmas Ruby
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